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Rockport North WWTP

Sewage treatment plant, Rockport, Indiana. NPDES permit IN0061662, in force until Mar 31, 2031. Last 12 months: over a limit 8 times (last September 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: outfall 001 form A monthly (19 values), outfall 002 form A monthly (23 values)
Last report on file
September 2026
Oct 2024 – Sep 2025
5 values over a limit, 1 required value missing, 1 of 12 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Period endingOutfallParameterReportedLimitOver by
October 2025001Nitrogen, ammonia total [as N], monthly average2.1 mg/L≤ 1.3 mg/L62%
October 2025001Nitrogen, ammonia total [as N], monthly average5.1 lb/d≤ 3.3 lb/d55%
October 2025001Nitrogen, ammonia total [as N], maximum weekly average20.1 lb/d≤ 4.8 lb/d319%
October 2025001Nitrogen, ammonia total [as N], maximum weekly average8.1 mg/L≤ 1.9 mg/L326%
October 2025001Solids, total suspended, maximum weekly average148.8 lb/d≤ 113 lb/d32%
October 2025001Solids, total suspended, maximum weekly average48 mg/L≤ 45 mg/L7%
July 2026002Phosphorus, total [as P], monthly average2.3 mg/L≤ 1 mg/L130%
September 2026002Phosphorus, total [as P], monthly average1.1 mg/L≤ 1 mg/L10%

Limits in force (53)

ParameterStatisticLimitMonthsOutfall
Oxygen, dissolved [DO]daily average minimum≥ 6 mg/LMay–Nov001
Oxygen, dissolved [DO]daily average minimum≥ 5 mg/LJan, Feb, Mar, Apr, Dec001
pHdaily minimum≥ 6 SUall year001
pHdaily maximum≤ 9 SUall year001
Solids, total suspendedmonthly average≤ 30 mg/Lall year001
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall year001
Solids, total suspendedmonthly average≤ 75 lb/dall year001
Solids, total suspendedmaximum weekly average≤ 113 lb/dall year001
Nitrogen, ammonia total [as N]monthly average≤ 1.3 mg/LMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 1.9 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]maximum weekly average≤ 1.9 mg/LMay–Nov001
Nitrogen, ammonia total [as N]maximum weekly average≤ 2.9 mg/LJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]monthly average≤ 3.3 lb/dMay–Nov001
Nitrogen, ammonia total [as N]monthly average≤ 4.8 lb/dJan, Feb, Mar, Apr, Dec001
Nitrogen, ammonia total [as N]maximum weekly average≤ 4.8 lb/dMay–Nov001
Nitrogen, ammonia total [as N]maximum weekly average≤ 7.3 lb/dJan, Feb, Mar, Apr, Dec001
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year001
E. coli, colony forming units [CFU]monthly geometric mean≤ 125 CFU/100mLApr–Oct001
E. coli, colony forming units [CFU]daily maximum≤ 235 CFU/100mLApr–Oct001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/Lall year001
BOD, carbonaceous [5 day, 20 C]monthly average≤ 63 lb/dall year001
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 100 lb/dall year001
Flow, totalmonthly totalreport only (Mgal/mo)all year001
Oxygen, dissolved [DO]daily minimum≥ 6 mg/Lall year002
pHdaily minimum≥ 6 SUall year002
pHdaily maximum≤ 9 SUall year002
Solids, total suspendedmonthly average≤ 12 mg/Lall year002
Solids, total suspendedmaximum weekly average≤ 18 mg/Lall year002
Solids, total suspendedmonthly average≤ 120 lb/dall year002
Solids, total suspendedmaximum weekly average≤ 190 lb/dall year002
Nitrogen, total [as N]monthly averagereport only (mg/L)all year002
Nitrogen, total [as N]monthly averagereport only (lb/d)all year002
Nitrogen, ammonia total [as N]monthly average≤ 1.1 mg/LMay–Nov002
Nitrogen, ammonia total [as N]monthly average≤ 1.6 mg/LJan, Feb, Mar, Apr, Dec002
Nitrogen, ammonia total [as N]maximum weekly average≤ 1.6 mg/LMay–Nov002
Nitrogen, ammonia total [as N]maximum weekly average≤ 2.4 mg/LJan, Feb, Mar, Apr, Dec002
Nitrogen, ammonia total [as N]monthly average≤ 11 lb/dMay–Nov002
Nitrogen, ammonia total [as N]monthly average≤ 17 lb/dJan, Feb, Mar, Apr, Dec002
Nitrogen, ammonia total [as N]maximum weekly average≤ 17 lb/dMay–Nov002
Nitrogen, ammonia total [as N]maximum weekly average≤ 25 lb/dJan, Feb, Mar, Apr, Dec002
Phosphorus, total [as P]monthly average≤ 1 mg/Lall year002
Phosphorus, total [as P]monthly averagereport only (lb/d)all year002
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year002
E. coli, colony forming units [CFU]monthly geometric mean≤ 125 CFU/100mLApr–Oct002
E. coli, colony forming units [CFU]daily maximum≤ 235 CFU/100mLApr–Oct002
Mercury, total recoverabledaily maximumreport only (ng/L)Feb, Apr, Jun, Aug, Oct, Dec002
Mercury, total recoverabledaily maximumreport only (ng/L)Feb, Apr, Jun, Aug, Oct, Dec002
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/Lall year002
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 15 mg/Lall year002
BOD, carbonaceous [5 day, 20 C]monthly average≤ 100 lb/dall year002
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 160 lb/dall year002
Flow, totalmonthly totalreport only (Mgal/mo)all year002

New limits from Apr 1, 2030

ParameterNew limitNew or tighterMedian, last 12 months× new limit
Toxicity [acute], Ceriodaphnia dubia, maximum1 tox acute (Sep)new——
Toxicity [acute], Pimephales promelas [Fathead Minnow], maximum1 tox acute (Sep)new——
Toxicity [chronic], Ceriodaphnia dubia, maximum1 tox chronic (Sep)new——
Toxicity [chronic], Pimephales promelas [Fathead Minnow], maximum1 tox chronic (Sep)new——

How strict are these limits?

Cited limits by parameter: Indiana's rules and the federal ones.

Check this month's numbers Email me before each report is due

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/IN0061662 · MCP: https://passage-data.com/mcp