Metropolitan Water Reclamation District of Greater Chicago — NPDES permit IL0047741: limits, due date and EPA's record

Sewage treatment plant, major discharger, Des Plaines, Illinois. NPDES permit IL0047741 expired Jul 31, 2026; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Limits in force (424)

Parameter	Statistic	Limit	Months	Outfall
Temperature, water deg. fahrenheit	monthly maximum	report only (deg F)	all year	001
Temperature, water deg. fahrenheit	monthly maximum	report only (deg F)	all year	001
Temperature, water deg. fahrenheit	monthly maximum	report only (deg F)	all year	001
Temperature, water deg. fahrenheit	monthly maximum	report only (deg F)	all year	001
Specific conductance	daily maximum	report only (uS/cm)	all year	001
Specific conductance	daily maximum	report only (uS/cm)	all year	001
Specific conductance	daily maximum	report only (uS/cm)	all year	001
Specific conductance	daily maximum	report only (uS/cm)	all year	001
Specific conductance	daily maximum	report only (uS/cm)	all year	001
Specific conductance	daily maximum	report only (uS/cm)	all year	001
Specific conductance	daily maximum	report only (uS/cm)	all year	001
Specific conductance	daily maximum	report only (uS/cm)	all year	001
Oxygen, dissolved [DO]	monthly average minimum	≥ 5.5 mg/L	Jan, Feb, Aug, Sep, Oct, Nov, Dec	001
Oxygen, dissolved [DO]	monthly average minimum	≥ 5.5 mg/L	Jan, Feb, Aug, Sep, Oct, Nov, Dec	001
Oxygen, dissolved [DO]	monthly average minimum	≥ 5.5 mg/L	Jan, Feb, Aug, Sep, Oct, Nov, Dec	001
Oxygen, dissolved [DO]	monthly average minimum	≥ 5.5 mg/L	Jan, Feb, Aug, Sep, Oct, Nov, Dec	001
Oxygen, dissolved [DO]	minimum weekly average	≥ 6 mg/L	Mar–Jul	001
Oxygen, dissolved [DO]	minimum weekly average	≥ 6 mg/L	Mar–Jul	001
Oxygen, dissolved [DO]	minimum weekly average	≥ 4 mg/L	Jan, Feb, Aug, Sep, Oct, Nov, Dec	001
Oxygen, dissolved [DO]	minimum weekly average	≥ 4 mg/L	Jan, Feb, Aug, Sep, Oct, Nov, Dec	001
Oxygen, dissolved [DO]	minimum weekly average	≥ 6 mg/L	Mar–Jul	001
Oxygen, dissolved [DO]	minimum weekly average	≥ 6 mg/L	Mar–Jul	001
Oxygen, dissolved [DO]	minimum weekly average	≥ 4 mg/L	Jan, Feb, Aug, Sep, Oct, Nov, Dec	001
Oxygen, dissolved [DO]	minimum weekly average	≥ 4 mg/L	Jan, Feb, Aug, Sep, Oct, Nov, Dec	001
Oxygen, dissolved [DO]	daily minimum	≥ 5 mg/L	Mar–Jul	001
Oxygen, dissolved [DO]	daily minimum	≥ 5 mg/L	Mar–Jul	001
Oxygen, dissolved [DO]	daily minimum	≥ 3.5 mg/L	Jan, Feb, Aug, Sep, Oct, Nov, Dec	001
Oxygen, dissolved [DO]	daily minimum	≥ 3.5 mg/L	Jan, Feb, Aug, Sep, Oct, Nov, Dec	001
Oxygen, dissolved [DO]	daily minimum	≥ 5 mg/L	Mar–Jul	001
Oxygen, dissolved [DO]	daily minimum	≥ 5 mg/L	Mar–Jul	001
Oxygen, dissolved [DO]	daily minimum	≥ 3.5 mg/L	Jan, Feb, Aug, Sep, Oct, Nov, Dec	001
Oxygen, dissolved [DO]	daily minimum	≥ 3.5 mg/L	Jan, Feb, Aug, Sep, Oct, Nov, Dec	001
pH	minimum	≥ 6 SU	all year	001
pH	minimum	≥ 6 SU	all year	001
pH	minimum	≥ 6 SU	all year	001
pH	minimum	≥ 6 SU	all year	001
pH	maximum	≤ 9 SU	all year	001
pH	maximum	≤ 9 SU	all year	001
pH	maximum	≤ 9 SU	all year	001
pH	maximum	≤ 9 SU	all year	001
Alkalinity, total [as CaCO3]	daily maximum	report only (mg/L)	all year	001
Alkalinity, total [as CaCO3]	daily maximum	report only (mg/L)	all year	001
Alkalinity, total [as CaCO3]	daily maximum	report only (mg/L)	all year	001
Alkalinity, total [as CaCO3]	daily maximum	report only (mg/L)	all year	001
Alkalinity, total [as CaCO3]	daily maximum	report only (mg/L)	all year	001
Alkalinity, total [as CaCO3]	daily maximum	report only (mg/L)	all year	001
Alkalinity, total [as CaCO3]	daily maximum	report only (mg/L)	all year	001
Alkalinity, total [as CaCO3]	daily maximum	report only (mg/L)	all year	001
Solids, total suspended	monthly average	≤ 5 mg/L	all year	001
Solids, total suspended	monthly average	≤ 5 mg/L	all year	001
Solids, total suspended	monthly average	≤ 12 mg/L	all year	001
Solids, total suspended	monthly average	≤ 12 mg/L	all year	001
Solids, total suspended	daily maximum	≤ 24 mg/L	all year	001
Solids, total suspended	daily maximum	≤ 24 mg/L	all year	001
Solids, total suspended	daily maximum	≤ 24 mg/L	all year	001
Solids, total suspended	daily maximum	≤ 24 mg/L	all year	001
Solids, total suspended	monthly average	≤ 2168 lb/d	all year	001
Solids, total suspended	monthly average	≤ 2168 lb/d	all year	001
Solids, total suspended	monthly average	≤ 11009 lb/d	all year	001
Solids, total suspended	monthly average	≤ 11009 lb/d	all year	001
Solids, total suspended	daily maximum	≤ 10408 lb/d	all year	001
Solids, total suspended	daily maximum	≤ 10408 lb/d	all year	001
Solids, total suspended	daily maximum	≤ 22018 lb/d	all year	001
Solids, total suspended	daily maximum	≤ 22018 lb/d	all year	001
Oil & Grease	daily maximum	report only (mg/L)	all year	001
Nitrogen, total [as N]	monthly average	report only (mg/L)	all year	001
Nitrogen, total [as N]	monthly average	report only (mg/L)	all year	001
Nitrogen, total [as N]	monthly average	report only (mg/L)	all year	001
Nitrogen, total [as N]	monthly average	report only (mg/L)	all year	001
Nitrogen, total [as N]	daily maximum	report only (mg/L)	all year	001
Nitrogen, total [as N]	daily maximum	report only (mg/L)	all year	001
Nitrogen, total [as N]	daily maximum	report only (mg/L)	all year	001
Nitrogen, total [as N]	daily maximum	report only (mg/L)	all year	001
Nitrogen, ammonia total [as N]	monthly average	≤ 4 mg/L	Jan	001
Nitrogen, ammonia total [as N]	monthly average	≤ 4 mg/L	Jan	001
Nitrogen, ammonia total [as N]	monthly average	≤ 2.1 mg/L	Apr	001
Nitrogen, ammonia total [as N]	monthly average	≤ 2.1 mg/L	Apr	001
Nitrogen, ammonia total [as N]	monthly average	≤ 2.1 mg/L	May	001
Nitrogen, ammonia total [as N]	monthly average	≤ 2.1 mg/L	May	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1.6 mg/L	Jun	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1.6 mg/L	Jun	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1.6 mg/L	Aug	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1.6 mg/L	Aug	001
Nitrogen, ammonia total [as N]	monthly average	≤ 4 mg/L	Dec	001
Nitrogen, ammonia total [as N]	monthly average	≤ 4 mg/L	Dec	001
Nitrogen, ammonia total [as N]	monthly average	≤ 2.1 mg/L	Sep	001
Nitrogen, ammonia total [as N]	monthly average	≤ 2.1 mg/L	Sep	001
Nitrogen, ammonia total [as N]	monthly average	≤ 4 mg/L	Feb	001
Nitrogen, ammonia total [as N]	monthly average	≤ 4 mg/L	Feb	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1.6 mg/L	Jul	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1.6 mg/L	Jul	001
Nitrogen, ammonia total [as N]	monthly average	≤ 2.1 mg/L	Mar	001
Nitrogen, ammonia total [as N]	monthly average	≤ 2.1 mg/L	Mar	001
Nitrogen, ammonia total [as N]	monthly average	≤ 2.1 mg/L	Oct	001
Nitrogen, ammonia total [as N]	monthly average	≤ 2.1 mg/L	Oct	001
Nitrogen, ammonia total [as N]	monthly average	≤ 4 mg/L	Nov	001
Nitrogen, ammonia total [as N]	monthly average	≤ 4 mg/L	Nov	001
Nitrogen, ammonia total [as N]	monthly average	≤ 2.1 mg/L	Mar, Apr, May, Sep, Oct	001
Nitrogen, ammonia total [as N]	monthly average	≤ 2.1 mg/L	Mar, Apr, May, Sep, Oct	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1.6 mg/L	Jun–Aug	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1.6 mg/L	Jun–Aug	001
Nitrogen, ammonia total [as N]	monthly average	≤ 4 mg/L	Jan, Feb, Nov, Dec	001
Nitrogen, ammonia total [as N]	monthly average	≤ 4 mg/L	Jan, Feb, Nov, Dec	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 8.4 mg/L	Jan	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 8.4 mg/L	Jan	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7.8 mg/L	Apr	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7.8 mg/L	Apr	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7.8 mg/L	May	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7.8 mg/L	May	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 11.1 mg/L	Jun	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 11.1 mg/L	Jun	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 11.1 mg/L	Aug	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 11.1 mg/L	Aug	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 8.4 mg/L	Dec	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 8.4 mg/L	Dec	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7.8 mg/L	Sep	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7.8 mg/L	Sep	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 8.4 mg/L	Feb	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 8.4 mg/L	Feb	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 11.1 mg/L	Jul	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 11.1 mg/L	Jul	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7.8 mg/L	Mar	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7.8 mg/L	Mar	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7.8 mg/L	Oct	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7.8 mg/L	Oct	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 8.4 mg/L	Nov	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 8.4 mg/L	Nov	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7.8 mg/L	Mar, Apr, May, Sep, Oct	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7.8 mg/L	Mar, Apr, May, Sep, Oct	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 11.1 mg/L	Jun–Aug	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 11.1 mg/L	Jun–Aug	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 8.4 mg/L	Jan, Feb, Nov, Dec	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 8.4 mg/L	Jan, Feb, Nov, Dec	001
Nitrogen, ammonia total [as N]	monthly average	≤ 3670 lb/d	Jan	001
Nitrogen, ammonia total [as N]	monthly average	≤ 3670 lb/d	Jan	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1927 lb/d	Apr	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1927 lb/d	Apr	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1927 lb/d	May	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1927 lb/d	May	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1468 lb/d	Jun	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1468 lb/d	Jun	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1468 lb/d	Aug	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1468 lb/d	Aug	001
Nitrogen, ammonia total [as N]	monthly average	≤ 3670 lb/d	Dec	001
Nitrogen, ammonia total [as N]	monthly average	≤ 3670 lb/d	Dec	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1927 lb/d	Sep	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1927 lb/d	Sep	001
Nitrogen, ammonia total [as N]	monthly average	≤ 3670 lb/d	Feb	001
Nitrogen, ammonia total [as N]	monthly average	≤ 3670 lb/d	Feb	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1468 lb/d	Jul	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1468 lb/d	Jul	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1927 lb/d	Mar	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1927 lb/d	Mar	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1927 lb/d	Oct	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1927 lb/d	Oct	001
Nitrogen, ammonia total [as N]	monthly average	≤ 3670 lb/d	Nov	001
Nitrogen, ammonia total [as N]	monthly average	≤ 3670 lb/d	Nov	001
Nitrogen, ammonia total [as N]	monthly average	≤ 911 lb/d	Mar, Apr, May, Sep, Oct	001
Nitrogen, ammonia total [as N]	monthly average	≤ 911 lb/d	Mar, Apr, May, Sep, Oct	001
Nitrogen, ammonia total [as N]	monthly average	≤ 694 lb/d	Jun–Aug	001
Nitrogen, ammonia total [as N]	monthly average	≤ 694 lb/d	Jun–Aug	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1735 lb/d	Jan, Feb, Nov, Dec	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1735 lb/d	Jan, Feb, Nov, Dec	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7706 lb/d	Jan	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7706 lb/d	Jan	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7156 lb/d	Apr	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7156 lb/d	Apr	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7156 lb/d	May	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7156 lb/d	May	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 10183 lb/d	Jun	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 10183 lb/d	Jun	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 10183 lb/d	Aug	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 10183 lb/d	Aug	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7706 lb/d	Dec	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7706 lb/d	Dec	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7156 lb/d	Sep	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7156 lb/d	Sep	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7706 lb/d	Feb	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7706 lb/d	Feb	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 10183 lb/d	Jul	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 10183 lb/d	Jul	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7156 lb/d	Mar	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7156 lb/d	Mar	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7156 lb/d	Oct	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7156 lb/d	Oct	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7706 lb/d	Nov	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 7706 lb/d	Nov	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 3383 lb/d	Mar, Apr, May, Sep, Oct	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 3383 lb/d	Mar, Apr, May, Sep, Oct	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 4814 lb/d	Jun–Aug	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 4814 lb/d	Jun–Aug	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 3643 lb/d	Jan, Feb, Nov, Dec	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 3643 lb/d	Jan, Feb, Nov, Dec	001
Nitrogen, ammonia total [as N]	weekly average	≤ 5.3 mg/L	Oct	001
Nitrogen, ammonia total [as N]	weekly average	≤ 5.3 mg/L	Oct	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4 mg/L	Aug	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4 mg/L	Aug	001
Nitrogen, ammonia total [as N]	weekly average	≤ 5.3 mg/L	Apr	001
Nitrogen, ammonia total [as N]	weekly average	≤ 5.3 mg/L	Apr	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4 mg/L	Jun	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4 mg/L	Jun	001
Nitrogen, ammonia total [as N]	weekly average	≤ 5.3 mg/L	Sep	001
Nitrogen, ammonia total [as N]	weekly average	≤ 5.3 mg/L	Sep	001
Nitrogen, ammonia total [as N]	weekly average	≤ 5.3 mg/L	May	001
Nitrogen, ammonia total [as N]	weekly average	≤ 5.3 mg/L	May	001
Nitrogen, ammonia total [as N]	weekly average	≤ 5.3 mg/L	Mar	001
Nitrogen, ammonia total [as N]	weekly average	≤ 5.3 mg/L	Mar	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4 mg/L	Jul	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4 mg/L	Jul	001
Nitrogen, ammonia total [as N]	weekly average	≤ 5.2 mg/L	Mar	001
Nitrogen, ammonia total [as N]	weekly average	≤ 5.2 mg/L	Mar	001
Nitrogen, ammonia total [as N]	weekly average	≤ 5.2 mg/L	Apr	001
Nitrogen, ammonia total [as N]	weekly average	≤ 5.2 mg/L	Apr	001
Nitrogen, ammonia total [as N]	weekly average	≤ 5.2 mg/L	May	001
Nitrogen, ammonia total [as N]	weekly average	≤ 5.2 mg/L	May	001
Nitrogen, ammonia total [as N]	weekly average	≤ 5.2 mg/L	Sep	001
Nitrogen, ammonia total [as N]	weekly average	≤ 5.2 mg/L	Sep	001
Nitrogen, ammonia total [as N]	weekly average	≤ 5.2 mg/L	Oct	001
Nitrogen, ammonia total [as N]	weekly average	≤ 5.2 mg/L	Oct	001
Nitrogen, ammonia total [as N]	weekly average	≤ 5.2 mg/L	Mar, Apr, May, Sep, Oct	001
Nitrogen, ammonia total [as N]	weekly average	≤ 5.2 mg/L	Mar, Apr, May, Sep, Oct	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4 mg/L	Jun–Aug	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4 mg/L	Jun–Aug	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4862 lb/d	Oct	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4862 lb/d	Oct	001
Nitrogen, ammonia total [as N]	weekly average	≤ 3670 lb/d	Aug	001
Nitrogen, ammonia total [as N]	weekly average	≤ 3670 lb/d	Aug	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4862 lb/d	Apr	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4862 lb/d	Apr	001
Nitrogen, ammonia total [as N]	weekly average	≤ 3670 lb/d	Jun	001
Nitrogen, ammonia total [as N]	weekly average	≤ 3670 lb/d	Jun	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4862 lb/d	Sep	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4862 lb/d	Sep	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4862 lb/d	May	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4862 lb/d	May	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4862 lb/d	Mar	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4862 lb/d	Mar	001
Nitrogen, ammonia total [as N]	weekly average	≤ 3670 lb/d	Jul	001
Nitrogen, ammonia total [as N]	weekly average	≤ 3670 lb/d	Jul	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4771 lb/d	Mar	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4771 lb/d	Mar	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4771 lb/d	Apr	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4771 lb/d	Apr	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4771 lb/d	May	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4771 lb/d	May	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4771 lb/d	Sep	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4771 lb/d	Sep	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4771 lb/d	Oct	001
Nitrogen, ammonia total [as N]	weekly average	≤ 4771 lb/d	Oct	001
Nitrogen, ammonia total [as N]	weekly average	≤ 2255 lb/d	Mar, Apr, May, Sep, Oct	001
Nitrogen, ammonia total [as N]	weekly average	≤ 2255 lb/d	Mar, Apr, May, Sep, Oct	001
Nitrogen, ammonia total [as N]	weekly average	≤ 1735 lb/d	Jun–Aug	001
Nitrogen, ammonia total [as N]	weekly average	≤ 1735 lb/d	Jun–Aug	001
Nitrogen, Kjeldahl, total [as N]	daily maximum	report only (mg/L)	all year	001
Nitrogen, Kjeldahl, total [as N]	daily maximum	report only (mg/L)	all year	001
Nitrogen, Kjeldahl, total [as N]	daily maximum	report only (mg/L)	all year	001
Nitrogen, Kjeldahl, total [as N]	daily maximum	report only (mg/L)	all year	001
Nitrite + Nitrate total [as N]	daily maximum	report only (mg/L)	all year	001
Nitrite + Nitrate total [as N]	daily maximum	report only (mg/L)	all year	001
Nitrite + Nitrate total [as N]	daily maximum	report only (mg/L)	all year	001
Nitrite + Nitrate total [as N]	daily maximum	report only (mg/L)	all year	001
Phosphorus, total [as P]	monthly average	report only (mg/L)	all year	001
Phosphorus, total [as P]	monthly average	report only (mg/L)	all year	001
Phosphorus, total [as P]	monthly average	report only (mg/L)	all year	001
Phosphorus, total [as P]	monthly average	report only (mg/L)	all year	001
Phosphorus, total [as P]	daily maximum	report only (mg/L)	all year	001
Phosphorus, total [as P]	daily maximum	report only (mg/L)	all year	001
Phosphorus, total [as P]	daily maximum	report only (mg/L)	all year	001
Phosphorus, total [as P]	daily maximum	report only (mg/L)	all year	001
Phosphorus, dissolved	daily maximum	report only (mg/L)	all year	001
Phosphorus, dissolved	daily maximum	report only (mg/L)	all year	001
Phosphorus, dissolved	daily maximum	report only (mg/L)	all year	001
Phosphorus, dissolved	daily maximum	report only (mg/L)	all year	001
Carbon, tot organic [TOC]	monthly average	report only (mg/L)	all year	001
Carbon, tot organic [TOC]	monthly average	report only (mg/L)	all year	001
Carbon, tot organic [TOC]	monthly average	report only (mg/L)	all year	001
Carbon, tot organic [TOC]	monthly average	report only (mg/L)	all year	001
Carbon, tot organic [TOC]	daily maximum	report only (mg/L)	all year	001
Carbon, tot organic [TOC]	daily maximum	report only (mg/L)	all year	001
Carbon, tot organic [TOC]	daily maximum	report only (mg/L)	all year	001
Carbon, tot organic [TOC]	daily maximum	report only (mg/L)	all year	001
Cyanide, total [as CN]	daily maximum	report only (ug/L)	all year	001
Cyanide, free [amenable to chlorination]	daily maximum	report only (ug/L)	all year	001
Chloride [as Cl]	monthly average	report only (mg/L)	Jan, Feb, Mar, Apr, Dec	001
Chloride [as Cl]	monthly average	report only (mg/L)	Jan, Feb, Mar, Apr, Dec	001
Chloride [as Cl]	monthly average	report only (mg/L)	Jan, Feb, Mar, Apr, Dec	001
Chloride [as Cl]	monthly average	report only (mg/L)	Jan, Feb, Mar, Apr, Dec	001
Chloride [as Cl]	daily maximum	report only (mg/L)	Jan, Feb, Mar, Apr, Dec	001
Chloride [as Cl]	daily maximum	report only (mg/L)	Jan, Feb, Mar, Apr, Dec	001
Chloride [as Cl]	daily maximum	report only (mg/L)	Jan, Feb, Mar, Apr, Dec	001
Chloride [as Cl]	daily maximum	report only (mg/L)	Jan, Feb, Mar, Apr, Dec	001
Fluoride, total [as F]	daily maximum	report only (mg/L)	all year	001
Arsenic, total [as As]	daily maximum	report only (mg/L)	all year	001
Barium, total [as Ba]	daily maximum	report only (mg/L)	all year	001
Beryllium, total [as Be]	daily maximum	report only (mg/L)	all year	001
Cadmium, total [as Cd]	daily maximum	report only (mg/L)	all year	001
Chromium, hexavalent [as Cr]	daily maximum	report only (mg/L)	all year	001
Chromium, total [as Cr]	daily maximum	report only (mg/L)	all year	001
Copper, total [as Cu]	daily maximum	report only (mg/L)	all year	001
Iron, total [as Fe]	daily maximum	report only (mg/L)	all year	001
Iron, dissolved [as Fe]	daily maximum	report only (mg/L)	all year	001
Lead, total [as Pb]	daily maximum	report only (mg/L)	all year	001
Manganese, total [as Mn]	daily maximum	report only (mg/L)	all year	001
Thallium, total [as Tl]	daily maximum	report only (mg/L)	all year	001
Nickel, total [as Ni]	daily maximum	report only (mg/L)	all year	001
Silver, total [as Ag]	daily maximum	report only (mg/L)	all year	001
Zinc, total [as Zn]	daily maximum	report only (mg/L)	all year	001
Antimony, total [as Sb]	daily maximum	report only (mg/L)	all year	001
Selenium, total [as Se]	daily maximum	report only (mg/L)	all year	001
Coliform, fecal - % samples exceeding limit	maximum	≤ 10 %	May–Oct	001
Coliform, fecal - % samples exceeding limit	maximum	≤ 10 %	May–Oct	001
Coliform, fecal - % samples exceeding limit	maximum	≤ 10 %	May–Nov	001
Coliform, fecal - % samples exceeding limit	maximum	≤ 10 %	May–Nov	001
Phenolics, total recoverable	daily maximum	report only (mg/L)	all year	001
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	001
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	001
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	001
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	001
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	001
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	001
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	001
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	001
Chlorine, total residual	daily maximum	≤ .038 mg/L	Jan, Feb, Mar, Apr, Nov, Dec	001
Chlorine, total residual	daily maximum	≤ .038 mg/L	Jan, Feb, Mar, Apr, Nov, Dec	001
Chlorine, total residual	daily maximum	≤ .038 mg/L	May–Oct	001
Chlorine, total residual	daily maximum	≤ .038 mg/L	May–Oct	001
Chlorine, total residual	daily maximum	≤ .038 mg/L	Jan, Feb, Mar, Apr, Nov, Dec	001
Chlorine, total residual	daily maximum	≤ .038 mg/L	Jan, Feb, Mar, Apr, Nov, Dec	001
Chlorine, total residual	daily maximum	≤ .038 mg/L	May–Oct	001
Chlorine, total residual	daily maximum	≤ .038 mg/L	May–Oct	001
Mercury, total [as Hg]	daily maximum	report only (ng/L)	all year	001
Coliform, fecal general	geometric mean	≤ 200 #/100mL	May–Oct	001
Coliform, fecal general	geometric mean	≤ 200 #/100mL	May–Oct	001
Coliform, fecal general	geometric mean	≤ 200 #/100mL	May–Oct	001
Coliform, fecal general	geometric mean	≤ 200 #/100mL	May–Oct	001
Coliform, fecal general	daily maximum	≤ 400 #/100mL	May–Oct	001
Coliform, fecal general	daily maximum	≤ 400 #/100mL	May–Oct	001
Coliform, fecal general	daily maximum	≤ 400 #/100mL	May–Oct	001
Coliform, fecal general	daily maximum	≤ 400 #/100mL	May–Oct	001
BOD, carbonaceous [5 day, 20 C]	monthly average	≤ 4 mg/L	all year	001
BOD, carbonaceous [5 day, 20 C]	monthly average	≤ 4 mg/L	all year	001
BOD, carbonaceous [5 day, 20 C]	monthly average	≤ 10 mg/L	all year	001
BOD, carbonaceous [5 day, 20 C]	monthly average	≤ 10 mg/L	all year	001
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 20 mg/L	all year	001
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 20 mg/L	all year	001
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 20 mg/L	all year	001
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 20 mg/L	all year	001
BOD, carbonaceous [5 day, 20 C]	monthly average	≤ 1735 lb/d	all year	001
BOD, carbonaceous [5 day, 20 C]	monthly average	≤ 1735 lb/d	all year	001
BOD, carbonaceous [5 day, 20 C]	monthly average	≤ 9174 lb/d	all year	001
BOD, carbonaceous [5 day, 20 C]	monthly average	≤ 9174 lb/d	all year	001
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 8674 lb/d	all year	001
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 8674 lb/d	all year	001
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 18348 lb/d	all year	001
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 18348 lb/d	all year	001
BOD, 5-day, 20 deg. C	daily maximum	report only (mg/L)	all year	002
Solids, total suspended	daily maximum	report only (mg/L)	all year	002
Coliform, fecal general	daily maximum	report only (#/100mL)	all year	002
Flow	monthly total	report only (#/mo)	all year	002
BOD, 5-day, 20 deg. C	monthly average	report only (mg/L)	all year	111
BOD, 5-day, 20 deg. C	monthly average	report only (mg/L)	all year	111
Solids, total suspended	monthly average	report only (mg/L)	all year	111
Solids, total suspended	monthly average	report only (mg/L)	all year	111
Carbon, tot organic [TOC]	monthly average	report only (mg/L)	all year	111
Carbon, tot organic [TOC]	monthly average	report only (mg/L)	all year	111
Carbon, tot organic [TOC]	monthly average	report only (mg/L)	all year	111
Carbon, tot organic [TOC]	monthly average	report only (mg/L)	all year	111
Carbon, tot organic [TOC]	weekly average	report only (mg/L)	all year	111
Carbon, tot organic [TOC]	weekly average	report only (mg/L)	all year	111
Carbon, tot organic [TOC]	daily maximum	report only (mg/L)	all year	111
Carbon, tot organic [TOC]	daily maximum	report only (mg/L)	all year	111
Duration	monthly total	report only (hr/mo)	all year	111
Duration	monthly total	report only (hr/mo)	all year	111
Coliform, fecal general	geometric mean	report only (#/100mL)	all year	111
Coliform, fecal general	geometric mean	report only (#/100mL)	all year	111
Coliform, fecal general	daily maximum	report only (#/100mL)	all year	111
Coliform, fecal general	daily maximum	report only (#/100mL)	all year	111
Flow	monthly total	report only (#/mo)	all year	111
Flow	monthly total	report only (#/mo)	all year	111
BOD, 5-day, 20 deg. C	monthly average	report only (mg/L)	all year	INF
BOD, 5-day, 20 deg. C	monthly average	report only (mg/L)	all year	INF
Solids, total suspended	monthly average	report only (mg/L)	all year	INF
Solids, total suspended	monthly average	report only (mg/L)	all year	INF
Nitrogen, total [as N]	monthly average	report only (mg/L)	all year	INF
Nitrogen, total [as N]	monthly average	report only (mg/L)	all year	INF
Nitrogen, total [as N]	daily maximum	report only (mg/L)	all year	INF
Nitrogen, total [as N]	daily maximum	report only (mg/L)	all year	INF
Phosphorus, total [as P]	monthly average	report only (mg/L)	all year	INF
Phosphorus, total [as P]	monthly average	report only (mg/L)	all year	INF
Phosphorus, total [as P]	daily maximum	report only (mg/L)	all year	INF
Phosphorus, total [as P]	daily maximum	report only (mg/L)	all year	INF
Carbon, tot organic [TOC]	monthly average	report only (mg/L)	all year	INF
Carbon, tot organic [TOC]	monthly average	report only (mg/L)	all year	INF
Carbon, tot organic [TOC]	monthly average	report only (mg/L)	all year	INF
Carbon, tot organic [TOC]	monthly average	report only (mg/L)	all year	INF
Carbon, tot organic [TOC]	weekly average	report only (mg/L)	all year	INF
Carbon, tot organic [TOC]	weekly average	report only (mg/L)	all year	INF
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	INF
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	INF
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	INF
Flow, in conduit or thru treatment plant	daily maximum	report only (MGD)	all year	INF
Oil & Grease	daily maximum	report only (mg/L)	all year	INFL
Cyanide, total [as CN]	daily maximum	report only (ug/L)	all year	INFL
Cyanide, free [amenable to chlorination]	daily maximum	report only (ug/L)	all year	INFL
Fluoride, total [as F]	daily maximum	report only (mg/L)	all year	INFL
Arsenic, total [as As]	daily maximum	report only (mg/L)	all year	INFL
Barium, total [as Ba]	daily maximum	report only (mg/L)	all year	INFL
Beryllium, total [as Be]	daily maximum	report only (mg/L)	all year	INFL
Cadmium, total [as Cd]	daily maximum	report only (mg/L)	all year	INFL
Chromium, hexavalent [as Cr]	daily maximum	report only (mg/L)	all year	INFL
Chromium, total [as Cr]	daily maximum	report only (mg/L)	all year	INFL
Copper, total [as Cu]	daily maximum	report only (mg/L)	all year	INFL
Iron, total [as Fe]	daily maximum	report only (mg/L)	all year	INFL
Iron, dissolved [as Fe]	daily maximum	report only (mg/L)	all year	INFL
Lead, total [as Pb]	daily maximum	report only (mg/L)	all year	INFL
Manganese, total [as Mn]	daily maximum	report only (mg/L)	all year	INFL
Thallium, total [as Tl]	daily maximum	report only (mg/L)	all year	INFL
Nickel, total [as Ni]	daily maximum	report only (mg/L)	all year	INFL
Silver, total [as Ag]	daily maximum	report only (mg/L)	all year	INFL
Zinc, total [as Zn]	daily maximum	report only (mg/L)	all year	INFL
Antimony, total [as Sb]	daily maximum	report only (mg/L)	all year	INFL
Selenium, total [as Se]	daily maximum	report only (mg/L)	all year	INFL
Phenolics, total recoverable	daily maximum	report only (mg/L)	all year	INFL
Mercury, total [as Hg]	daily maximum	report only (ng/L)	all year	INFL

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/IL0047741 · MCP: https://passage-data.com/mcp