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Clear Lake, City of

Sewage treatment plant, Clear Lake, South Dakota. NPDES permit SD0020699 expired Jun 30, 2024; its limits still apply. Last 12 months: no values over a limit. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (19 values), form W yearly
Last report on file
September 2026
Oct 2024 – Sep 2025
9 values over a limit, 15 required values missing, 1 of 13 reports late

Limits in force (41)

ParameterStatisticLimitMonths
Temperature, water deg. centigrade30-day averagereport only (deg C)all year
Temperature, water deg. centigradedaily maximumreport only (deg C)all year
Flow rate30-day averagereport only (MGD)all year
Flow ratedaily maximumreport only (MGD)all year
BOD, 5-day, 20 deg. C30-day average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum 7-day average≤ 45 mg/Lall year
pHdaily minimum≥ 6 SUall year
pHdaily maximum≤ 9 SUall year
Solids, total suspended30-day average≤ 30 mg/Lall year
Solids, total suspendedmaximum 7-day average≤ 45 mg/Lall year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]30-day average≤ 6.6 mg/LJan, Feb
Nitrogen, ammonia total [as N]30-day average≤ 6.6 mg/LMar
Nitrogen, ammonia total [as N]30-day average≤ 2.5 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ 2.4 mg/LMay
Nitrogen, ammonia total [as N]30-day average≤ 2.4 mg/LJun
Nitrogen, ammonia total [as N]30-day average≤ 1.4 mg/LJul
Nitrogen, ammonia total [as N]30-day average≤ 1.4 mg/LAug, Sep
Nitrogen, ammonia total [as N]30-day average≤ 2.4 mg/LOct
Nitrogen, ammonia total [as N]30-day average≤ 3.9 mg/LNov
Nitrogen, ammonia total [as N]30-day average≤ 3.9 mg/LDec
Nitrogen, ammonia total [as N]daily maximum≤ 10.2 mg/LJan, Feb
Nitrogen, ammonia total [as N]daily maximum≤ 10.6 mg/LMar
Nitrogen, ammonia total [as N]daily maximum≤ 7.9 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 6.8 mg/LMay
Nitrogen, ammonia total [as N]daily maximum≤ 6.2 mg/LJun
Nitrogen, ammonia total [as N]daily maximum≤ 6.3 mg/LJul
Nitrogen, ammonia total [as N]daily maximum≤ 6 mg/LAug, Sep
Nitrogen, ammonia total [as N]daily maximum≤ 4.8 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 4.9 mg/LNov
Nitrogen, ammonia total [as N]daily maximum≤ 4.8 mg/LDec
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
E. coli, colony forming units [CFU]30-day geometric mean≤ 630 #/100mLMay–Sep
E. coli, colony forming units [CFU]daily maximum≤ 1178 #/100mLMay–Sep
Flow, totalmonthly totalreport only (Mgal)all year
Flowing, Receiving Streamdaily maximumreport only (N=0;Y=1)all year
Toxicity [acute], Ceriodaphnia dubiadaily maximum< 1 tox acute (alert, not enforceable)all year
Toxicity [acute], Ceriodaphnia dubiadaily maximum< 1 tox acute (alert, not enforceable)all year
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximum< 1 tox acute (alert, not enforceable)all year
Toxicity [acute], Pimephales promelas [Fathead Minnow]daily maximum< 1 tox acute (alert, not enforceable)all year
Duration of dischargemonthly totalreport only (d)all year

How strict are these limits?

Cited limits by parameter: South Dakota'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/SD0020699 · MCP: https://passage-data.com/mcp