Ottawa, City of — NPDES permit KS0097535: limits, due date and EPA's record

Sewage treatment plant, major discharger, Ottawa, Kansas. NPDES permit KS0097535, in force until Feb 28, 2029. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Limits in force (90)

Parameter	Statistic	Limit	Months	Outfall
Conductivity	monthly average	report only (umho/cm)	all year	001
Oxygen, dissolved [DO]	minimum weekly average	report only (mg/L)	all year	001
BOD, 5-day, 20 deg. C	monthly average	≤ 30 mg/L	all year	001
BOD, 5-day, 20 deg. C	maximum weekly average	≤ 45 mg/L	all year	001
pH	daily minimum	≥ 6 SU	all year	001
pH	monthly average	report only (SU)	all year	001
pH	daily maximum	≤ 9 SU	all year	001
Solids, total suspended	monthly average	≤ 30 mg/L	all year	001
Solids, total suspended	maximum weekly average	≤ 45 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 (lb/d)	all year	001
Nitrogen, ammonia total [as N]	monthly average	≤ 3.3 mg/L	Apr	001
Nitrogen, ammonia total [as N]	monthly average	≤ 2.1 mg/L	May	001
Nitrogen, ammonia total [as N]	monthly average	report only (mg/L)	all year	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1.2 mg/L	Jul	001
Nitrogen, ammonia total [as N]	monthly average	≤ 4.7 mg/L	Feb	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1.2 mg/L	Aug	001
Nitrogen, ammonia total [as N]	monthly average	≤ 4.7 mg/L	Jan	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1.6 mg/L	Jun	001
Nitrogen, ammonia total [as N]	monthly average	≤ 1.5 mg/L	Sep	001
Nitrogen, ammonia total [as N]	monthly average	≤ 3.9 mg/L	Nov	001
Nitrogen, ammonia total [as N]	monthly average	≤ 2.5 mg/L	Oct	001
Nitrogen, ammonia total [as N]	monthly average	≤ 4.7 mg/L	Mar	001
Nitrogen, ammonia total [as N]	monthly average	≤ 4.7 mg/L	Dec	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 8.7 mg/L	Apr	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 5.2 mg/L	May	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 2.8 mg/L	Jul	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 10.3 mg/L	Feb	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 2.9 mg/L	Aug	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 10.3 mg/L	Jan	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 3.9 mg/L	Jun	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 3.4 mg/L	Sep	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 10.3 mg/L	Nov	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 6.2 mg/L	Oct	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 10.3 mg/L	Mar	001
Nitrogen, ammonia total [as N]	daily maximum	≤ 10.3 mg/L	Dec	001
Nitrogen, Kjeldahl, total [as N]	monthly average	report only (mg/L)	all year	001
Nitrite + Nitrate total [as N]	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 (lb/d)	all year	001
Hardness, total [as CaCO3]	monthly average	report only (mg/L)	all year	001
Arsenic, total recoverable	monthly average	report only (ug/L)	all year	001
Selenium, total recoverable	monthly average	report only (ug/L)	all year	001
Thallium, total recoverable	monthly average	report only (ug/L)	all year	001
Beryllium, total recoverable [as Be]	monthly average	report only (ug/L)	all year	001
Nickel, total recoverable	monthly average	report only (ug/L)	all year	001
Silver total recoverable	monthly average	report only (ug/L)	all year	001
Zinc, total recoverable	monthly average	report only (ug/L)	all year	001
Cadmium, total recoverable	monthly average	report only (ug/L)	all year	001
Lead, total recoverable	monthly average	report only (ug/L)	all year	001
Chromium, total recoverable	monthly average	report only (ug/L)	all year	001
Copper, total recoverable	monthly average	report only (ug/L)	all year	001
Antimony, total recoverable	monthly average	report only (ug/L)	all year	001
Priority Pollutants	monthly average	report only (mg/L)	all year	001
Flow, in conduit or thru treatment plant	monthly average	report only (MGD)	all year	001
E. coli	monthly geometric mean	≤ 262 #/100mL	Apr	001
E. coli	monthly geometric mean	≤ 262 #/100mL	May	001
E. coli	monthly geometric mean	≤ 2358 #/100mL	Feb	001
E. coli	monthly geometric mean	≤ 262 #/100mL	Oct	001
E. coli	monthly geometric mean	= 2358 #/100mL	Mar	001
E. coli	monthly geometric mean	≤ 262 #/100mL	Jun	001
E. coli	monthly geometric mean	≤ 262 #/100mL	Jul	001
E. coli	monthly geometric mean	≤ 2358 #/100mL	Dec	001
E. coli	monthly geometric mean	≤ 2358 #/100mL	Jan	001
E. coli	monthly geometric mean	≤ 2358 #/100mL	Nov	001
E. coli	monthly geometric mean	≤ 262 #/100mL	Sep	001
E. coli	monthly geometric mean	≤ 262 #/100mL	Aug	001
E. coli	weekly geometric mean	≤ 4348 #/100mL	Apr	001
E. coli	weekly geometric mean	≤ 4348 #/100mL	May	001
E. coli	weekly geometric mean	report only (#/100mL)	Feb	001
E. coli	weekly geometric mean	≤ 4348 #/100mL	Oct	001
E. coli	weekly geometric mean	report only (#/100mL)	Mar	001
E. coli	weekly geometric mean	≤ 4348 #/100mL	Jun	001
E. coli	weekly geometric mean	≤ 4348 #/100mL	Jul	001
E. coli	weekly geometric mean	report only (#/100mL)	Dec	001
E. coli	weekly geometric mean	report only (#/100mL)	Jan	001
E. coli	weekly geometric mean	report only (#/100mL)	Nov	001
E. coli	weekly geometric mean	≤ 4348 #/100mL	Sep	001
E. coli	weekly geometric mean	≤ 4348 #/100mL	Aug	001
Nitrogen, Total As N	daily average	report only (mg/L)	all year	001
Nitrogen, Total As N	EPA's "DPD AVG"	report only (lb/d)	all year	001
Phosphorus, Total As P	daily average	report only (mg/L)	all year	001
Phosphorus, Total As P	EPA's "DPD AVG"	report only (lb/d)	all year	001
Mercury, total [as Hg]	monthly average	report only (ug/L)	all year	001
IC25 Static Renewal 7 Day Chronic Ceriodaphnia dubia	daily minimum	≥ 40 %	all year	001
IC25 Static Renewal 7 Day Chronic Pimephales	daily minimum	≥ 40 %	all year	001
BOD, 5-day, 20 deg. C	monthly average	report only (mg/L)	all year	002
Solids, total suspended	monthly average	report only (mg/L)	all year	002
Nitrogen, Kjeldahl, total [as N]	monthly average	report only (mg/L)	all year	002
Phosphorus, total [as P]	monthly average	report only (mg/L)	all year	002

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/KS0097535 · MCP: https://passage-data.com/mcp