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Lowcountry Regional Water System

Sewage treatment plant, major discharger, Hampton, South Carolina. NPDES permit SC0021318 expired Dec 31, 2024; its limits still apply. Last 12 months: over a limit 2 times (last March 2026). Source: EPA ECHO, Oct 22, 2026.

Reports due
About 29 days after each period: form 1 monthly (31 values), form 2 quarterly (8 values), form 3 yearly
Last report on file
September 2026
Oct 2024 – Sep 2025
1 value over a limit, 0 required values missing, 0 of 17 reports late

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

Period endingParameterReportedLimitOver by
October 2025BOD, 5-day, 20 deg. C, weekly average22≤ 15 mg/L47%
March 2026Nitrogen, ammonia total [as N], weekly average3.4≤ 3.32 mg/L2%

Limits in force (45)

ParameterStatisticLimitMonths
Oxygen demand, ultimatemonthly average≤ 326 lb/dMar–Oct
Oxygen demand, ultimateweekly average≤ 489 lb/dMar–Oct
Oxygen, dissolved [DO]minimum≥ 6 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 10 mg/Lall year
BOD, 5-day, 20 deg. Cweekly average≤ 15 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 167 lb/dall year
BOD, 5-day, 20 deg. Cweekly average≤ 251 lb/dall year
pHminimum≥ 6 SUall year
pHmaximum≤ 8.5 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 500 lb/dall year
Solids, total suspendedweekly average≤ 750 lb/dall year
Nitrogen, total [as N]monthly averagereport only (mg/L)all year
Nitrogen, total [as N]weekly averagereport only (mg/L)all year
Nitrogen, total [as N]monthly averagereport only (lb/d)all year
Nitrogen, total [as N]weekly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]monthly average≤ 4.23 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 2.21 mg/LMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 6.34 mg/LJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 3.32 mg/LMar–Oct
Nitrogen, ammonia total [as N]monthly average≤ 70 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 37 lb/dMar–Oct
Nitrogen, ammonia total [as N]weekly average≤ 105 lb/dJan, Feb, Nov, Dec
Nitrogen, ammonia total [as N]weekly average≤ 56 lb/dMar–Oct
Phosphorus, total [as P]monthly averagereport only (mg/L)all year
Phosphorus, total [as P]weekly averagereport only (mg/L)all year
Phosphorus, total [as P]monthly averagereport only (lb/d)all year
Phosphorus, total [as P]weekly averagereport only (lb/d)all year
Hardness, total [as CaCO3]monthly averagereport only (mg/L)all year
Hardness, total [as CaCO3]daily maximumreport only (mg/L)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantweekly averagereport only (MGD)all year
Chlorine, total residualmonthly average≤ .011 mg/Lall year
Chlorine, total residualdaily maximum≤ .019 mg/Lall year
Chlorine, total residualmonthly average≤ .18 lb/dall year
Chlorine, total residualdaily maximum≤ .32 lb/dall year
E. colimonthly geometric mean≤ 126 #/100mLall year
E. colidaily maximum≤ 349 #/100mLall year
E. colimonthly geometric mean≤ 126 #/100mLall year
E. colidaily maximum≤ 800 #/100mLall year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiamonthly averagereport only (%)all year
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubiadaily maximumreport only (%)all year

How strict are these limits?

Cited limits by parameter: South Carolina'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/SC0021318 · MCP: https://passage-data.com/mcp