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Locust Grove PWA

Sewage treatment plant, Locust Grove, Oklahoma. NPDES permit OK0022772, in force until Nov 30, 2030. Last 12 months: over a limit 52 times (last August 2026), 3 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (17 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
67 values over a limit, 14 required values missing, 2 of 12 reports late

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

All 52 values over a limit
Period endingParameterReportedLimitOver by
October 2025Chlorine, total residual, instantaneous maximum.59 mg/L≤ .099 mg/L496%
October 2025E. coli, daily maximum20000 CFU/100mL≤ 2030 CFU/100mL885%
October 2025E. coli, geometric mean2522 CFU/100mL≤ 630 CFU/100mL300%
November 2025Chlorine, total residual, instantaneous maximum.4 mg/L≤ .099 mg/L304%
November 2025E. coli, daily maximum8500 CFU/100mL≤ 2030 CFU/100mL319%
November 2025E. coli, geometric mean960 CFU/100mL≤ 630 CFU/100mL52%
November 2025Oxygen, dissolved [DO], monthly minimum3.5 mg/L≥ 6 mg/L42%
December 2025BOD, 5-day, 20 deg. C, monthly average46.97 mg/L≤ 20 mg/L135%
December 2025BOD, 5-day, 20 deg. C, weekly average65 mg/L≤ 30 mg/L117%
December 2025Chlorine, total residual, instantaneous maximum.33 mg/L≤ .099 mg/L233%
December 2025E. coli, daily maximum7207 CFU/100mL≤ 2030 CFU/100mL255%
December 2025E. coli, geometric mean14600 CFU/100mL≤ 630 CFU/100mL2217%
December 2025Oxygen, dissolved [DO], minimum5.63 mg/L≥ 6 mg/L6%
December 2025Solids, total suspended, monthly average155.54 lb/d≤ 152.62 lb/d2%
December 2025Solids, total suspended, monthly average95.23 mg/L≤ 30 mg/L217%
December 2025Solids, total suspended, weekly average127 mg/L≤ 45 mg/L182%
January 2026E. coli, daily maximum2400 CFU/100mL≤ 2030 CFU/100mL18%
January 2026E. coli, geometric mean787 CFU/100mL≤ 630 CFU/100mL25%
January 2026Oxygen, dissolved [DO], minimum5.99 mg/L≥ 6 mg/L0%
January 2026Solids, total suspended, weekly average60 mg/L≤ 45 mg/L33%
February 2026E. coli, daily maximum20000 CFU/100mL≤ 2030 CFU/100mL885%
February 2026E. coli, geometric mean1905 CFU/100mL≤ 630 CFU/100mL202%
March 2026BOD, 5-day, 20 deg. C, monthly average26.19 mg/L≤ 20 mg/L31%
March 2026BOD, 5-day, 20 deg. C, weekly average39.9 mg/L≤ 30 mg/L33%
March 2026Solids, total suspended, monthly average35.53 mg/L≤ 30 mg/L18%
March 2026Solids, total suspended, weekly average75 mg/L≤ 45 mg/L67%
April 2026BOD, carbonaceous [5 day, 20 C], monthly average11.65 mg/L≤ 10 mg/L17%
April 2026BOD, carbonaceous [5 day, 20 C], weekly average17.4 mg/L≤ 15 mg/L16%
April 2026Chlorine, total residual, instantaneous maximum.1 mg/L≤ .099 mg/L1%
April 2026E. coli, daily maximum2800 CFU/100mL≤ 2030 CFU/100mL38%
April 2026Oxygen, dissolved [DO], minimum5.13 mg/L≥ 6 mg/L15%
May 2026E. coli, daily maximum20000 CFU/100mL≤ 406 CFU/100mL4826%
May 2026E. coli, geometric mean2651 CFU/100mL≤ 126 CFU/100mL2004%
May 2026Oxygen, dissolved [DO], minimum3.98 mg/L≥ 6 mg/L34%
June 2026BOD, carbonaceous [5 day, 20 C], weekly average15.1 mg/L≤ 15 mg/L1%
June 2026E. coli, daily maximum20000 CFU/100mL≤ 406 CFU/100mL4826%
June 2026E. coli, geometric mean932 CFU/100mL≤ 126 CFU/100mL640%
June 2026Nitrogen, ammonia total [as N], monthly average2.017 mg/L≤ 2 mg/L1%
June 2026Nitrogen, ammonia total [as N], weekly average5.4 mg/L≤ 3 mg/L80%
July 2026Chlorine, total residual, instantaneous maximum.13 mg/L≤ .099 mg/L31%
July 2026E. coli, daily maximum20000 CFU/100mL≤ 406 CFU/100mL4826%
July 2026E. coli, geometric mean128 CFU/100mL≤ 126 CFU/100mL2%
August 2026BOD, carbonaceous [5 day, 20 C], monthly average10.64 mg/L≤ 10 mg/L6%
August 2026BOD, carbonaceous [5 day, 20 C], weekly average16 mg/L≤ 15 mg/L7%
August 2026E. coli, daily maximum20000 CFU/100mL≤ 406 CFU/100mL4826%
August 2026E. coli, geometric mean392 CFU/100mL≤ 126 CFU/100mL211%
August 2026Nitrogen, ammonia total [as N], monthly average4.149 mg/L≤ 2 mg/L107%
August 2026Nitrogen, ammonia total [as N], weekly average7.21 mg/L≤ 3 mg/L140%
August 2026Oxygen, dissolved [DO], minimum3.88 mg/L≥ 4 mg/L3%
August 2026Solids, total suspended, monthly average40.9 mg/L≤ 15 mg/L173%
August 2026Solids, total suspended, monthly average84 lb/d≤ 76.31 lb/d10%
August 2026Solids, total suspended, weekly average58.3 mg/L≤ 22.5 mg/L159%

Limits in force (29)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]minimum≥ 4 mg/LJun–Oct
Oxygen, dissolved [DO]minimum≥ 6 mg/LJan, Feb, Mar, Apr, May, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 20 mg/LJan, Feb, Mar, Nov, Dec
BOD, 5-day, 20 deg. Cweekly average≤ 30 mg/LJan, Feb, Mar, Nov, Dec
BOD, 5-day, 20 deg. Cmonthly average≤ 101.75 lb/dJan, Feb, Mar, Nov, Dec
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 15 mg/LApr–Oct
Solids, total suspendedmonthly average≤ 30 mg/LJan, Feb, Mar, Nov, Dec
Solids, total suspendedweekly average≤ 22.5 mg/LApr–Oct
Solids, total suspendedweekly average≤ 45 mg/LJan, Feb, Mar, Nov, Dec
Solids, total suspendedmonthly average≤ 76.31 lb/dApr–Oct
Solids, total suspendedmonthly average≤ 152.62 lb/dJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 5 mg/LApr, May
Nitrogen, ammonia total [as N]monthly average≤ 2 mg/LJun–Oct
Nitrogen, ammonia total [as N]weekly average≤ 7.5 mg/LApr, May
Nitrogen, ammonia total [as N]weekly average≤ 3 mg/LJun–Oct
Nitrogen, ammonia total [as N]monthly average≤ 25.44 lb/dApr, May
Nitrogen, ammonia total [as N]monthly average≤ 10.17 lb/dJun–Oct
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 residualinstantaneous maximum≤ .099 mg/Lall year
E. coligeometric mean≤ 126 CFU/100mLMay–Sep
E. coligeometric mean≤ 630 CFU/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
E. colidaily maximum≤ 406 CFU/100mLMay–Sep
E. colidaily maximum≤ 2030 CFU/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
BOD, carbonaceous [5 day, 20 C]monthly average≤ 10 mg/LApr–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 15 mg/LApr–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 50.87 lb/dApr–Oct

How strict are these limits?

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

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