Passage Data · Check a report · Use it from your AI

Lennox, City of

Sewage treatment plant, Lennox, South Dakota. NPDES permit SD0021768, in force until Dec 31, 2027. 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 (24 values), form W quarterly (2 values), form ME yearly, form MI yearly
Renewal application due
Jul 4, 2027 · 180 days before expiry; your permit may set another date
Last report on file
September 2026
Oct 2024 – Sep 2025
3 values over a limit, 0 required values missing, 0 of 18 reports late

Limits in force (86)

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
BOD, 5-day, 20 deg. C30-day averagereport only (mg/L)all year
pHdaily minimum≥ 6.5 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 and grease, hexane extr methoddaily maximum≤ 10 mg/Lall year
Nitrogen, total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]30-day averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]30-day average≤ 10.5 lb/dApr
Nitrogen, ammonia total [as N]30-day average≤ 17.7 lb/dFeb
Nitrogen, ammonia total [as N]30-day average≤ 10 lb/dNov
Nitrogen, ammonia total [as N]30-day average≤ 3.3 lb/dAug
Nitrogen, ammonia total [as N]30-day average≤ 3.7 lb/dJun
Nitrogen, ammonia total [as N]30-day average≤ 18.7 lb/dJan
Nitrogen, ammonia total [as N]30-day average≤ 13.8 lb/dDec
Nitrogen, ammonia total [as N]30-day average≤ 9.8 lb/dOct
Nitrogen, ammonia total [as N]30-day average≤ 3.5 lb/dJul
Nitrogen, ammonia total [as N]30-day average≤ 13.3 lb/dMar
Nitrogen, ammonia total [as N]30-day average≤ 6.3 lb/dMay
Nitrogen, ammonia total [as N]30-day average≤ 5.1 lb/dSep
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 lb/dApr
Nitrogen, ammonia total [as N]daily maximum≤ 46.5 lb/dFeb
Nitrogen, ammonia total [as N]daily maximum≤ 16.3 lb/dNov
Nitrogen, ammonia total [as N]daily maximum≤ 13.1 lb/dAug
Nitrogen, ammonia total [as N]daily maximum≤ 12.6 lb/dJun
Nitrogen, ammonia total [as N]daily maximum≤ 28.3 lb/dJan
Nitrogen, ammonia total [as N]daily maximum≤ 23.6 lb/dDec
Nitrogen, ammonia total [as N]daily maximum≤ 13.3 lb/dOct
Nitrogen, ammonia total [as N]daily maximum≤ 12.1 lb/dJul
Nitrogen, ammonia total [as N]daily maximum≤ 18 lb/dMar
Nitrogen, ammonia total [as N]daily maximum≤ 11.2 lb/dMay
Nitrogen, ammonia total [as N]daily maximum≤ 16.3 lb/dSep
Phosphorus, total [as P]daily maximumreport only (mg/L)all year
Cyanide, weak acid, dissociablevaluereport only (ug/L)all year
Cyanide, weak acid, dissociablevaluereport only (ug/L)all year
Cyanide, total [as CN]valuereport only (ug/L)all year
Cyanide, total [as CN]valuereport only (ug/L)all year
Hardness, total [as CaCO3]valuereport only (mg/L)all year
Hardness, total [as CaCO3]valuereport only (mg/L)all year
Arsenic, total recoverablevaluereport only (ug/L)all year
Arsenic, total recoverablevaluereport only (ug/L)all year
Selenium, total recoverablevaluereport only (ug/L)all year
Selenium, total recoverablevaluereport only (ug/L)all year
Thallium, total recoverablevaluereport only (ug/L)all year
Thallium, total recoverablevaluereport only (ug/L)all year
Beryllium, total recoverable [as Be]valuereport only (ug/L)all year
Beryllium, total recoverable [as Be]valuereport only (ug/L)all year
Nickel, total recoverablevaluereport only (ug/L)all year
Nickel, total recoverablevaluereport only (ug/L)all year
Silver total recoverablevaluereport only (ug/L)all year
Silver total recoverablevaluereport only (ug/L)all year
Zinc, total recoverablevaluereport only (ug/L)all year
Zinc, total recoverablevaluereport only (ug/L)all year
Aluminum, total recoverablevaluereport only (ug/L)all year
Aluminum, total recoverablevaluereport only (ug/L)all year
Cadmium, total recoverablevaluereport only (ug/L)all year
Cadmium, total recoverablevaluereport only (ug/L)all year
Lead, total recoverablevaluereport only (ug/L)all year
Lead, total recoverablevaluereport only (ug/L)all year
Chromium, total recoverablevaluereport only (ug/L)all year
Chromium, total recoverablevaluereport only (ug/L)all year
Copper, total recoverablevaluereport only (ug/L)all year
Copper, total recoverablevaluereport only (ug/L)all year
Molybdenum, total recoverablevaluereport only (ug/L)all year
Molybdenum, total recoverablevaluereport only (ug/L)all year
Antimony, total recoverablevaluereport only (ug/L)all year
Antimony, total recoverablevaluereport only (ug/L)all year
Phenolsvaluereport only (ug/L)all year
Phenolsvaluereport 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< 2.4 tox chronicall year
Toxicity [chronic], Pimephales promelas [Fathead Minnow]daily maximum< 2.4 tox chronicall year
Mercury, total recoverablevaluereport only (ug/L)all year
Mercury, total recoverablevaluereport only (ug/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< 1 abst=0;prst=1all 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

· Save this facility as a site · Superfund sites nearby · Your permits on one board

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/SD0021768 · MCP: https://passage-data.com/mcp