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Mercer County PSD

Sewage treatment plant, Matoaka, West Virginia. NPDES permit WV0024864, in force until Apr 9, 2029. Last 12 months: over a limit 21 times (last July 2026), 180 required values missing, 10 of 10 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 25 days after each period: form A monthly (30 values)
Last report on file
July 2026
Oct 2024 – Sep 2025
29 values over a limit, 270 required values missing, 12 of 12 reports late

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

All 21 values over a limit
Period endingParameterReportedLimitOver by
October 2025Copper, total recoverable, daily maximum.015 mg/L≤ .014 mg/L7%
October 2025Copper, total recoverable, monthly average.015 mg/L≤ .008 mg/L88%
October 2025Zinc, total recoverable, monthly average.11 mg/L≤ .06 mg/L83%
February 2026Coliform, fecal general, daily maximum2419.6 #/100mL≤ 400 #/100mL505%
February 2026Coliform, fecal general, daily maximum2419.6 #/100mL≤ 400 #/100mL505%
February 2026Coliform, fecal general, monthly geometric mean2419.6 #/100mL≤ 200 #/100mL1110%
February 2026Coliform, fecal general, monthly geometric mean2419.6 #/100mL≤ 200 #/100mL1110%
February 2026pH, instantaneous maximum9.28 SU≤ 9 SU—
March 2026pH, instantaneous maximum9.09 SU≤ 9 SU—
May 2026Copper, total recoverable, monthly average.009 mg/L≤ .008 mg/L13%
May 2026Copper, total recoverable, monthly average.009 mg/L≤ .008 mg/L13%
July 2026BOD, 5-day, 20 deg. C, monthly average6.16 lb/d≤ 3.1 lb/d99%
July 2026BOD, 5-day, 20 deg. C, monthly average6.16 lb/d≤ 3.1 lb/d99%
July 2026BOD, 5-day, 20 deg. C, monthly average8.3 mg/L≤ 5 mg/L66%
July 2026BOD, 5-day, 20 deg. C, monthly average8.3 mg/L≤ 5 mg/L66%
July 2026BOD, 5-day, percent removal, monthly average minimum58.3 %≥ 85 %178%
July 2026BOD, 5-day, percent removal, monthly average minimum58.3 %≥ 85 %178%
July 2026Copper, total recoverable, daily maximum.035 mg/L≤ .014 mg/L150%
July 2026Copper, total recoverable, daily maximum.035 mg/L≤ .014 mg/L150%
July 2026Copper, total recoverable, monthly average.035 mg/L≤ .008 mg/L338%
July 2026Copper, total recoverable, monthly average.035 mg/L≤ .008 mg/L338%

Limits in force (38)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 7.25 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 10 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 5 mg/LMay–Oct
BOD, 5-day, 20 deg. Cdaily maximum≤ 20 mg/LJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cdaily maximum≤ 10 mg/LMay–Oct
BOD, 5-day, 20 deg. Cmonthly average≤ 6.2 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 3.1 lb/dMay–Oct
BOD, 5-day, 20 deg. Cdaily maximum≤ 12.5 lb/dJan, Feb, Mar, Apr, Nov, Dec
BOD, 5-day, 20 deg. Cdaily maximum≤ 6.2 lb/dMay–Oct
pHinstantaneous minimum≥ 6 SUall year
pHinstantaneous maximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendeddaily maximum≤ 60 mg/Lall year
Solids, total suspendedmonthly average≤ 18.8 lb/dall year
Solids, total suspendeddaily maximum≤ 37.5 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 3 mg/LMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 6 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 6 mg/LMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 12 mg/LJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 1.9 lb/dMay–Oct
Nitrogen, ammonia total [as N]monthly average≤ 3.8 lb/dJan, Feb, Mar, Apr, Nov, Dec
Nitrogen, ammonia total [as N]daily maximum≤ 3.8 lb/dMay–Oct
Nitrogen, ammonia total [as N]daily maximum≤ 7.5 lb/dJan, Feb, Mar, Apr, Nov, Dec
Zinc, total recoverablemonthly average≤ .06 mg/Lall year
Zinc, total recoverabledaily maximum≤ .12 mg/Lall year
Lead, total recoverablemonthly average≤ .002 mg/Lall year
Lead, total recoverabledaily maximum≤ .006 mg/Lall year
Copper, total recoverablemonthly average≤ .008 mg/Lall year
Copper, total recoverabledaily maximum≤ .014 mg/Lall year
Flow, in conduit or thru treatment plantminimumreport only (MGD)all year
Flow, in conduit or thru treatment plantmonthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantdaily maximumreport only (MGD)all year
Chlorine, total residualmonthly average≤ 0 mg/Lall year
Chlorine, total residualdaily maximum≤ 0 mg/Lall year
Coliform, fecal generalmonthly geometric mean≤ 200 #/100mLall year
Coliform, fecal generaldaily maximum≤ 400 #/100mLall year
BOD, 5-day, percent removalmonthly average minimum≥ 85 %all year
Solids, suspended percent removalmonthly average minimum≥ 85 %all year

How strict are these limits?

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

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