City of Cedar Rapids — NPDES permit IA0042641: limits, due date and EPA's record

Sewage treatment plant, major discharger, Cedar Rapids, Iowa. NPDES permit IA0042641, in force until Aug 31, 2030. Last 12 months: no values over a limit, 2 required values missing. Source: EPA ECHO, Oct 22, 2026.

Limits in force (153)

Parameter	Statistic	Limit	Months	Outfall
Streamflow	30-day average	report only (cfs)	all year	001
Streamflow	daily maximum	report only (cfs)	all year	001
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 4.1 lb/CFS/d	Aug	001
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 4.5 lb/CFS/d	Apr	001
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 4.2 lb/CFS/d	Sep	001
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 4.5 lb/CFS/d	Jul	001
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 3.6 lb/CFS/d	Jun	001
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 11.5 lb/CFS/d	Feb	001
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 4.5 lb/CFS/d	Nov	001
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 4.5 lb/CFS/d	May	001
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 4.5 lb/CFS/d	Mar	001
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 4.5 lb/CFS/d	Dec	001
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 11.5 lb/CFS/d	Jan	001
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 4.5 lb/CFS/d	Oct	001
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 7.7 lb/CFS/d	Aug	001
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 6.4 lb/CFS/d	Apr	001
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 6.4 lb/CFS/d	Sep	001
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 7.7 lb/CFS/d	Jul	001
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 6.4 lb/CFS/d	Jun	001
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 16.3 lb/CFS/d	Feb	001
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 6.4 lb/CFS/d	Nov	001
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 6.4 lb/CFS/d	May	001
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 6.4 lb/CFS/d	Mar	001
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 6.4 lb/CFS/d	Dec	001
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 16.3 lb/CFS/d	Jan	001
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 6.4 lb/CFS/d	Oct	001
Oxygen, dissolved [DO]	daily minimum	≥ .8 mg/L	all year	001
pH	daily minimum	≥ 6 SU	all year	001
pH	daily maximum	≤ 9 SU	all year	001
Solids, total suspended	30-day average	≤ 120 mg/L	all year	001
Solids, total suspended	daily maximum	≤ 200 mg/L	all year	001
Solids, total suspended	30-day average	≤ 56045 lb/d	all year	001
Solids, total suspended	daily maximum	≤ 93048 lb/d	all year	001
Cyanide, total [as CN]	30-day average	≤ .027689 mg/L	all year	001
Cyanide, total [as CN]	daily maximum	≤ .1047 mg/L	all year	001
Cyanide, total [as CN]	30-day average	≤ 12.93 lb/d	all year	001
Cyanide, total [as CN]	daily maximum	≤ 48.88 lb/d	all year	001
Cadmium, total [as Cd]	30-day average	≤ .001 mg/L	all year	001
Cadmium, total [as Cd]	daily maximum	≤ .01 mg/L	all year	001
Cadmium, total [as Cd]	30-day average	≤ .646 lb/d	all year	001
Cadmium, total [as Cd]	daily maximum	≤ 4.6 lb/d	all year	001
Copper, total [as Cu]	30-day average	≤ .03 mg/L	all year	001
Copper, total [as Cu]	daily maximum	≤ .049 mg/L	all year	001
Copper, total [as Cu]	30-day average	≤ 14.1 lb/d	all year	001
Copper, total [as Cu]	daily maximum	≤ 22.9 lb/d	all year	001
Chlorine, total residual	30-day average	≤ .1 mg/L	all year	001
Chlorine, total residual	daily maximum	≤ .15 mg/L	all year	001
Chlorine, total residual	30-day average	≤ 48 lb/d	all year	001
Chlorine, total residual	daily maximum	≤ 68 lb/d	all year	001
E. coli	geometric mean	≤ 126 #/100mL	Mar–Nov	001
Toxicity [acute], Ceriodaphnia dubia	daily maximum	≤ 1 N=0;Y=1	all year	001
Toxicity [acute], Pimephales promelas [Fathead Minnow]	daily maximum	≤ 1 N=0;Y=1	all year	001
BOD, carbonaceous [5 day, 20 C]	30-day average	≤ 113 mg/L	all year	001
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 276 mg/L	all year	001
BOD, carbonaceous [5-day, 20 C][streamflow]	30-day average	≤ 20 lb/CFS/d	all year	001
BOD, carbonaceous [5-day, 20 C][streamflow]	daily maximum	≤ 20 lb/CFS/d	all year	001
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 1.3 lb/CFS/d	Jul	004
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 2 lb/CFS/d	Dec	004
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 1.8 lb/CFS/d	May	004
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 1.9 lb/CFS/d	Jan	004
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 1.9 lb/CFS/d	Apr	004
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 1.3 lb/CFS/d	Aug	004
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 2 lb/CFS/d	Oct	004
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 1.1 lb/CFS/d	Jun	004
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 1.9 lb/CFS/d	Mar	004
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 1.3 lb/CFS/d	Sep	004
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 1.8 lb/CFS/d	Nov	004
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 1.8 lb/CFS/d	Feb	004
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 2.2 lb/CFS/d	Jul	004
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 2 lb/CFS/d	Dec	004
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 1.9 lb/CFS/d	May	004
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 1.9 lb/CFS/d	Jan	004
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 1.9 lb/CFS/d	Apr	004
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 2.1 lb/CFS/d	Aug	004
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 2 lb/CFS/d	Oct	004
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 1.8 lb/CFS/d	Jun	004
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 1.9 lb/CFS/d	Mar	004
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 2.1 lb/CFS/d	Sep	004
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 1.8 lb/CFS/d	Nov	004
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 1.8 lb/CFS/d	Feb	004
Oxygen, dissolved [DO]	daily minimum	≥ .8 mg/L	all year	004
pH	daily minimum	≥ 6.1 SU	all year	004
pH	daily maximum	≤ 9 SU	all year	004
Solids, total suspended	30-day average	≤ 120 mg/L	all year	004
Solids, total suspended	daily maximum	≤ 200 mg/L	all year	004
Solids, total suspended	30-day average	≤ 56045 lb/d	all year	004
Solids, total suspended	daily maximum	≤ 93048 lb/d	all year	004
Cyanide, total [as CN]	30-day average	≤ .012 mg/L	all year	004
Cyanide, total [as CN]	daily maximum	≤ .02458 mg/L	all year	004
Cyanide, total [as CN]	30-day average	≤ 5.56 lb/d	all year	004
Cyanide, total [as CN]	daily maximum	≤ 11.4 lb/d	all year	004
Cadmium, total [as Cd]	30-day average	≤ .001 mg/L	all year	004
Cadmium, total [as Cd]	daily maximum	≤ .002 mg/L	all year	004
Cadmium, total [as Cd]	30-day average	≤ .29 lb/d	all year	004
Cadmium, total [as Cd]	daily maximum	≤ 1.11 lb/d	all year	004
Copper, total [as Cu]	30-day average	≤ .015 mg/L	all year	004
Copper, total [as Cu]	daily maximum	≤ .015 mg/L	all year	004
Copper, total [as Cu]	30-day average	≤ 7.05 lb/d	all year	004
Copper, total [as Cu]	daily maximum	≤ 7.05 lb/d	all year	004
Zinc, total [as Zn]	30-day average	≤ .133 mg/L	all year	004
Zinc, total [as Zn]	daily maximum	≤ .133 mg/L	all year	004
Zinc, total [as Zn]	30-day average	≤ 62 lb/d	all year	004
Zinc, total [as Zn]	daily maximum	≤ 62 lb/d	all year	004
Selenium, total [as Se]	30-day average	≤ .011 mg/L	all year	004
Selenium, total [as Se]	daily maximum	≤ .02157 mg/L	all year	004
Selenium, total [as Se]	30-day average	≤ 5.34 lb/d	all year	004
Selenium, total [as Se]	daily maximum	≤ 10 lb/d	all year	004
Chlorine, total residual	30-day average	≤ .222 mg/L	all year	004
Chlorine, total residual	daily maximum	≤ .32 mg/L	all year	004
Chlorine, total residual	30-day average	≤ 103.7 lb/d	all year	004
Chlorine, total residual	daily maximum	≤ 150 lb/d	all year	004
E. coli	geometric mean	≤ 126 #/100mL	Mar–Nov	004
BOD, carbonaceous [5 day, 20 C]	30-day average	≤ 113 mg/L	all year	004
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 276 mg/L	all year	004
BOD, carbonaceous [5-day, 20 C][streamflow]	30-day average	≤ 20 lb/CFS/d	all year	004
BOD, carbonaceous [5-day, 20 C][streamflow]	daily maximum	≤ 20 lb/CFS/d	all year	004
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 1 lb/CFS/d	Sep	117
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 1.3 lb/CFS/d	Feb	117
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 1.1 lb/CFS/d	May	117
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 1.1 lb/CFS/d	Aug	117
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 1 lb/CFS/d	Jun	117
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 1 lb/CFS/d	Nov	117
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 1.2 lb/CFS/d	Mar	117
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 1 lb/CFS/d	Dec	117
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 1 lb/CFS/d	Oct	117
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 1 lb/CFS/d	Apr	117
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 1.2 lb/CFS/d	Jul	117
Nitrogen, ammonia per cfs of streamflow	30-day average	≤ 1.2 lb/CFS/d	Jan	117
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 1 lb/CFS/d	Sep	117
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 1.3 lb/CFS/d	Feb	117
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 1.1 lb/CFS/d	May	117
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 1.1 lb/CFS/d	Aug	117
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 1 lb/CFS/d	Jun	117
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 1 lb/CFS/d	Nov	117
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 1.2 lb/CFS/d	Mar	117
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 1 lb/CFS/d	Dec	117
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 1 lb/CFS/d	Oct	117
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 1 lb/CFS/d	Apr	117
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 1.2 lb/CFS/d	Jul	117
Nitrogen, ammonia per cfs of streamflow	daily maximum	≤ 1.2 lb/CFS/d	Jan	117
pH	daily minimum	≥ 6 SU	all year	117
pH	daily maximum	≤ 9 SU	all year	117
Solids, total suspended	30-day average	≤ 120 mg/L	all year	117
Solids, total suspended	daily maximum	≤ 200 mg/L	all year	117
Solids, total suspended	30-day average	≤ 56045 lb/d	all year	117
Solids, total suspended	daily maximum	≤ 93048 lb/d	all year	117
Chlorine, total residual	30-day average	≤ .1 mg/L	all year	117
Chlorine, total residual	daily maximum	≤ .15 mg/L	all year	117
Chlorine, total residual	30-day average	≤ 48 lb/d	all year	117
Chlorine, total residual	daily maximum	≤ 68 lb/d	all year	117
E. coli	geometric mean	≤ 126 #/100mL	Mar–Nov	117
BOD, carbonaceous [5 day, 20 C]	30-day average	≤ 113 mg/L	all year	117
BOD, carbonaceous [5 day, 20 C]	daily maximum	≤ 276 mg/L	all year	117

New limits from Sep 1, 2028

Parameter	New limit	New or tighter	Median, last 12 months	× new limit
Chlorine, total residual, 30-day average outfall 001	24.1 lb/d	tighter	—	—
Chlorine, total residual, 30-day average outfall 001	0.051 mg/L	tighter	—	—
Chlorine, total residual, daily maximum outfall 001	47.8 lb/d	tighter	—	—
Chlorine, total residual, daily maximum outfall 001	0.102 mg/L	tighter	—	—
Chlorine, total residual, 30-day average outfall 004	0.02 mg/L	tighter	—	—
Chlorine, total residual, 30-day average outfall 004	9.48 lb/d	tighter	—	—
Chlorine, total residual, daily maximum outfall 004	10 lb/d	tighter	—	—
Chlorine, total residual, daily maximum outfall 004	0.021 mg/L	tighter	—	—
Chlorine, total residual, 30-day average outfall 117	43.4 lb/d	tighter	—	—
Chlorine, total residual, 30-day average outfall 117	0.093 mg/L	tighter	—	—
Chlorine, total residual, daily maximum outfall 117	43.4 lb/d	tighter	—	—
Chlorine, total residual, daily maximum outfall 117	0.093 mg/L	tighter	—	—

How strict are these limits?

Your permit document is the final word. As JSON: /api/v1/permits/IA0042641 · MCP: https://passage-data.com/mcp