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Santa Claus WWTP, Town of

Sewage treatment plant, major discharger, Santa Claus, Indiana. NPDES permit IN0020605, in force until Mar 31, 2029. Last 12 months: over a limit once (last May 2026), 3 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (23 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
9 values over a limit, 0 required values missing, 0 of 12 reports late

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

Period endingParameterReportedLimitOver by
May 2026Solids, total suspended, maximum weekly average43.18 mg/L≤ 30 mg/L44%

Limits in force (40)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]daily average minimum≥ 6 mg/LMay–Nov
Oxygen, dissolved [DO]daily average minimum≥ 5 mg/LJan, Feb, Mar, Apr, Dec
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/LJan, Feb, Mar, Apr, Dec
Solids, total suspendedmonthly average≤ 20 mg/LMay–Nov
Solids, total suspendedmaximum weekly average≤ 45 mg/LJan, Feb, Mar, Apr, Dec
Solids, total suspendedmaximum weekly average≤ 30 mg/LMay–Nov
Solids, total suspendedmonthly average≤ 292.9 lb/dJan, Feb, Mar, Apr, Dec
Solids, total suspendedmonthly average≤ 195.3 lb/dMay–Nov
Solids, total suspendedmaximum weekly average≤ 439.4 lb/dJan, Feb, Mar, Apr, Dec
Solids, total suspendedmaximum weekly average≤ 292.9 lb/dMay–Nov
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly average≤ 1.3 mg/LMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ 1.9 mg/LJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]maximum weekly average≤ 2 mg/LMay–Nov
Nitrogen, ammonia total [as N]maximum weekly average≤ 2.9 mg/LJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]monthly average≤ 12.7 lb/dMay–Nov
Nitrogen, ammonia total [as N]monthly average≤ 18.6 lb/dJan, Feb, Mar, Apr, Dec
Nitrogen, ammonia total [as N]maximum weekly average≤ 19.5 lb/dMay–Nov
Nitrogen, ammonia total [as N]maximum weekly average≤ 28.3 lb/dJan, Feb, Mar, Apr, Dec
Phosphorus, total [as P]monthly average≤ 1 mg/Lall year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
E. coli, colony forming units [CFU]monthly geometric mean≤ 125 CFU/100mLApr–Oct
E. coli, colony forming units [CFU]daily maximum≤ 235 CFU/100mLApr–Oct
Toxicity [acute], Ceriodaphnia dubiamaximum≤ 1 tox acuteOct
Toxicity [chronic], Ceriodaphnia dubiamaximum≤ 1.3 tox chronicOct
Toxicity [acute], Pimephales promelas [Fathead Minnow]maximum≤ 1 tox acuteOct
Toxicity [chronic], Pimephales promelas [Fathead Minnow]maximum≤ 1.3 tox chronicOct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 25 mg/LJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 17 mg/LMay–Nov
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 40 mg/LJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 26 mg/LMay–Nov
BOD, carbonaceous [5 day, 20 C]monthly average≤ 244.1 lb/dJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 166 lb/dMay–Nov
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 390.5 lb/dJan, Feb, Mar, Apr, Dec
BOD, carbonaceous [5 day, 20 C]maximum weekly average≤ 253.9 lb/dMay–Nov
Flow, totalmonthly totalreport only (Mgal/mo)all year

New limits from Apr 1, 2028

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

How strict are these limits?

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

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