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Aberdeen, City of

Sewage treatment plant, major discharger, Aberdeen, South Dakota. NPDES permit SD0020702 expired Dec 31, 2025; its limits still apply. Last 12 months: over a limit once (last March 2026), 1 of 19 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (25 values), form W quarterly (2 values), form B every 24 months, form SE twice a year, form SI twice a year
Last report on file
September 2026
Oct 2024 – Sep 2025
0 values over a limit, 0 required values missing, 1 of 21 reports late

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

Period endingParameterReportedLimitOver by
March 2026Toxicity [chronic], Ceriodaphnia dubia, daily maximum1.26 tox chronic< 1.14 tox chronic11%

Limits in force (71)

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
Oxygen, dissolved [DO]daily minimumreport only (mg/L)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
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all 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
Solids, total suspended30-day averagereport only (mg/L)all year
Oil & Greasedaily maximum≤ 10 mg/Lall year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]30-day average≤ 1 mg/LApr
Nitrogen, ammonia total [as N]30-day average≤ .5 mg/LMay–Sep
Nitrogen, ammonia total [as N]30-day average≤ .5 mg/LOct
Nitrogen, ammonia total [as N]daily maximum≤ 6.6 mg/LJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 6.1 mg/LApr
Nitrogen, ammonia total [as N]daily maximum≤ 2 mg/LMay–Sep
Nitrogen, ammonia total [as N]daily maximum≤ 4.9 mg/LOct
Nitrogen, nitrate total [as N]daily maximumreport only (mg/L)all year
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Cyanide, weak acid, dissociabledaily maximumreport only (ug/L)all year
Cyanide, weak acid, dissociabledaily maximumreport only (ug/L)all year
Cyanide, total [as CN]daily maximumreport only (ug/L)all year
Cyanide, total [as CN]daily maximumreport only (ug/L)all year
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year
Arsenic, total [as As]daily maximumreport only (ug/L)all year
Arsenic, total [as As]daily maximumreport only (ug/L)all year
Beryllium, total [as Be]daily maximumreport only (ug/L)all year
Beryllium, total [as Be]daily maximumreport only (ug/L)all year
Cadmium, total [as Cd]daily maximumreport only (ug/L)all year
Cadmium, total [as Cd]daily maximumreport only (ug/L)all year
Chromium, total [as Cr]daily maximumreport only (ug/L)all year
Copper, total [as Cu]daily maximumreport only (ug/L)all year
Copper, total [as Cu]daily maximumreport only (ug/L)all year
Lead, total [as Pb]daily maximumreport only (ug/L)all year
Lead, total [as Pb]daily maximumreport only (ug/L)all year
Thallium, total [as Tl]daily maximumreport only (ug/L)all year
Thallium, total [as Tl]daily maximumreport only (ug/L)all year
Molybdenum, total [as Mo]daily maximumreport only (ug/L)all year
Molybdenum, total [as Mo]daily maximumreport only (ug/L)all year
Nickel, total [as Ni]daily maximumreport only (ug/L)all year
Nickel, total [as Ni]daily maximumreport only (ug/L)all year
Silver, total [as Ag]daily maximumreport only (ug/L)all year
Silver, total [as Ag]daily maximumreport only (ug/L)all year
Zinc, total [as Zn]daily maximumreport only (ug/L)all year
Zinc, total [as Zn]daily maximumreport only (ug/L)all year
Antimony, total [as Sb]daily maximumreport only (ug/L)all year
Antimony, total [as Sb]daily maximumreport only (ug/L)all year
Aluminum, total [as Al]daily maximumreport only (ug/L)all year
Aluminum, total [as Al]daily maximumreport only (ug/L)all year
Selenium, total [as Se]daily maximumreport only (ug/L)all year
Selenium, total [as Se]daily maximumreport only (ug/L)all year
Phenolsdaily maximumreport only (ug/L)all year
Phenolsdaily maximumreport only (ug/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
Toxicity [chronic], Ceriodaphnia dubiadaily maximum< 1.14 tox chronicall year
Toxicity [chronic], Pimephales promelas [Fathead Minnow]daily maximum< 1.14 tox chronicall year
Mercury, total [as Hg]daily maximumreport only (ug/L)all year
Mercury, total [as Hg]daily maximumreport only (ug/L)all year
BOD, carbonaceous [5 day, 20 C]daily maximumreport only (mg/L)all year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
Oil and grease visualdaily maximum≤ 0 N=0;Y=1all year
Report due [yrmoda]daily maximumreport only (Y=0;N=1)all year

How strict are these limits?

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

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/SD0020702 · MCP: https://passage-data.com/mcp