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Vian PWA

Sewage treatment plant, Vian, Oklahoma. NPDES permit OK0021512, in force until Jun 30, 2029. Last 12 months: over a limit 83 times (last August 2026), 50 required values missing, 9 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (16 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
117 values over a limit, 118 required values missing, 11 of 12 reports late

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

All 83 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, carbonaceous [5 day, 20 C], monthly average40.99 lb/d≤ 10 lb/d310%
October 2025BOD, carbonaceous [5 day, 20 C], monthly average40.99 lb/d≤ 10 lb/d310%
October 2025BOD, carbonaceous [5 day, 20 C], monthly average65.9 mg/L≤ 10 mg/L559%
October 2025BOD, carbonaceous [5 day, 20 C], monthly average65.9 mg/L≤ 10 mg/L559%
October 2025BOD, carbonaceous [5 day, 20 C], weekly average68.8 mg/L≤ 15 mg/L359%
October 2025BOD, carbonaceous [5 day, 20 C], weekly average68.8 mg/L≤ 15 mg/L359%
October 2025Nitrogen, ammonia total [as N], monthly average14.44 lb/d≤ 4 lb/d261%
October 2025Nitrogen, ammonia total [as N], monthly average14.44 lb/d≤ 4 lb/d261%
October 2025Nitrogen, ammonia total [as N], monthly average23 mg/L≤ 4 mg/L475%
October 2025Nitrogen, ammonia total [as N], monthly average23 mg/L≤ 4 mg/L475%
October 2025Nitrogen, ammonia total [as N], weekly average27 mg/L≤ 6 mg/L350%
October 2025Nitrogen, ammonia total [as N], weekly average27 mg/L≤ 6 mg/L350%
October 2025Solids, total suspended, monthly average42.21 lb/d≤ 15 lb/d181%
October 2025Solids, total suspended, monthly average42.21 lb/d≤ 15 lb/d181%
October 2025Solids, total suspended, monthly average67.6 mg/L≤ 15 mg/L351%
October 2025Solids, total suspended, monthly average67.6 mg/L≤ 15 mg/L351%
October 2025Solids, total suspended, weekly average70.5 mg/L≤ 22.5 mg/L213%
October 2025Solids, total suspended, weekly average70.5 mg/L≤ 22.5 mg/L213%
December 2025BOD, 5-day, 20 deg. C, monthly average72.5 lb/d≤ 20 lb/d263%
December 2025BOD, 5-day, 20 deg. C, monthly average72.5 lb/d≤ 20 lb/d263%
December 2025BOD, 5-day, 20 deg. C, monthly average77.7 mg/L≤ 20 mg/L289%
December 2025BOD, 5-day, 20 deg. C, monthly average77.7 mg/L≤ 20 mg/L289%
December 2025BOD, 5-day, 20 deg. C, weekly average81.6 mg/L≤ 30 mg/L172%
December 2025BOD, 5-day, 20 deg. C, weekly average81.6 mg/L≤ 30 mg/L172%
January 2026BOD, 5-day, 20 deg. C, monthly average43.89 lb/d≤ 20 lb/d119%
January 2026BOD, 5-day, 20 deg. C, monthly average77.45 mg/L≤ 20 mg/L287%
January 2026BOD, 5-day, 20 deg. C, weekly average125 mg/L≤ 30 mg/L317%
February 2026BOD, 5-day, 20 deg. C, monthly average110.5 mg/L≤ 20 mg/L453%
February 2026BOD, 5-day, 20 deg. C, monthly average113.84 lb/d≤ 20 lb/d469%
February 2026BOD, 5-day, 20 deg. C, weekly average112 mg/L≤ 30 mg/L273%
February 2026Solids, total suspended, monthly average43.25 mg/L≤ 30 mg/L44%
February 2026Solids, total suspended, monthly average47.72 lb/d≤ 30 lb/d59%
February 2026Solids, total suspended, weekly average53.5 mg/L≤ 45 mg/L19%
March 2026BOD, 5-day, 20 deg. C, monthly average58.95 lb/d≤ 20 lb/d195%
March 2026BOD, 5-day, 20 deg. C, monthly average62.95 mg/L≤ 20 mg/L215%
March 2026BOD, 5-day, 20 deg. C, weekly average97.2 mg/L≤ 30 mg/L224%
April 2026BOD, carbonaceous [5 day, 20 C], monthly average27.37 lb/d≤ 10 lb/d174%
April 2026BOD, carbonaceous [5 day, 20 C], monthly average45.1 mg/L≤ 10 mg/L351%
April 2026BOD, carbonaceous [5 day, 20 C], weekly average59.9 mg/L≤ 15 mg/L299%
April 2026Nitrogen, ammonia total [as N], monthly average10.16 lb/d≤ 6 lb/d69%
April 2026Nitrogen, ammonia total [as N], monthly average17.48 mg/L≤ 6 mg/L191%
April 2026Nitrogen, ammonia total [as N], weekly average25.8 mg/L≤ 9 mg/L187%
April 2026Solids, total suspended, monthly average28.24 lb/d≤ 15 lb/d88%
April 2026Solids, total suspended, monthly average49.85 mg/L≤ 15 mg/L232%
April 2026Solids, total suspended, weekly average78 mg/L≤ 22.5 mg/L247%
May 2026BOD, carbonaceous [5 day, 20 C], monthly average19.09 lb/d≤ 10 lb/d91%
May 2026BOD, carbonaceous [5 day, 20 C], monthly average24.15 mg/L≤ 10 mg/L142%
May 2026BOD, carbonaceous [5 day, 20 C], weekly average25.1 mg/L≤ 15 mg/L67%
May 2026E. coli, daily maximum2420 MPN/100mL≤ 406 MPN/100mL496%
May 2026E. coli, geometric mean914 MPN/100mL≤ 126 MPN/100mL625%
May 2026Nitrogen, ammonia total [as N], monthly average14.42 lb/d≤ 6 lb/d140%
May 2026Nitrogen, ammonia total [as N], monthly average18.25 mg/L≤ 6 mg/L204%
May 2026Nitrogen, ammonia total [as N], weekly average19.1 mg/L≤ 9 mg/L112%
May 2026Solids, total suspended, monthly average16.25 lb/d≤ 15 lb/d8%
May 2026Solids, total suspended, monthly average20.25 mg/L≤ 15 mg/L35%
May 2026Solids, total suspended, weekly average25.2 mg/L≤ 22.5 mg/L12%
June 2026BOD, carbonaceous [5 day, 20 C], monthly average24.85 mg/L≤ 10 mg/L149%
June 2026BOD, carbonaceous [5 day, 20 C], weekly average27.4 mg/L≤ 15 mg/L83%
June 2026E. coli, daily maximum2419 MPN/100mL≤ 406 MPN/100mL496%
June 2026E. coli, geometric mean2419 MPN/100mL≤ 126 MPN/100mL1820%
June 2026Nitrogen, ammonia total [as N], monthly average8.99 mg/L≤ 4 mg/L125%
June 2026Nitrogen, ammonia total [as N], weekly average10.8 mg/L≤ 6 mg/L80%
June 2026Solids, total suspended, monthly average19.4 mg/L≤ 15 mg/L29%
July 2026E. coli, daily maximum2420 MPN/100mL≤ 406 MPN/100mL496%
July 2026E. coli, daily maximum2420 MPN/100mL≤ 406 MPN/100mL496%
July 2026E. coli, geometric mean2420 MPN/100mL≤ 126 MPN/100mL1821%
July 2026E. coli, geometric mean2420 MPN/100mL≤ 126 MPN/100mL1821%
July 2026Nitrogen, ammonia total [as N], monthly average19.8 mg/L≤ 4 mg/L395%
July 2026Nitrogen, ammonia total [as N], monthly average19.8 mg/L≤ 4 mg/L395%
July 2026Nitrogen, ammonia total [as N], weekly average20.6 mg/L≤ 6 mg/L243%
July 2026Nitrogen, ammonia total [as N], weekly average20.6 mg/L≤ 6 mg/L243%
July 2026Solids, total suspended, monthly average35.6 mg/L≤ 15 mg/L137%
July 2026Solids, total suspended, monthly average35.6 mg/L≤ 15 mg/L137%
July 2026Solids, total suspended, weekly average37.6 mg/L≤ 22.5 mg/L67%
July 2026Solids, total suspended, weekly average37.6 mg/L≤ 22.5 mg/L67%
August 2026BOD, carbonaceous [5 day, 20 C], monthly average27.2 mg/L≤ 10 mg/L172%
August 2026BOD, carbonaceous [5 day, 20 C], weekly average35.7 mg/L≤ 15 mg/L138%
August 2026E. coli, daily maximum2420 MPN/100mL≤ 406 MPN/100mL496%
August 2026E. coli, geometric mean2214 MPN/100mL≤ 126 MPN/100mL1657%
August 2026Nitrogen, ammonia total [as N], monthly average19.05 mg/L≤ 4 mg/L376%
August 2026Nitrogen, ammonia total [as N], weekly average20.8 mg/L≤ 6 mg/L247%
August 2026Solids, total suspended, monthly average36.05 mg/L≤ 15 mg/L140%
August 2026Solids, total suspended, weekly average45.6 mg/L≤ 22.5 mg/L103%

Limits in force (25)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/LApr–Oct
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≤ 20 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≤ 15 lb/dApr–Oct
Solids, total suspendedmonthly average≤ 30 lb/dJan, Feb, Mar, Nov, Dec
Nitrogen, ammonia total [as N]monthly average≤ 6 mg/LApr, May
Nitrogen, ammonia total [as N]monthly average≤ 4 mg/LJun–Oct
Nitrogen, ammonia total [as N]weekly average≤ 9 mg/LApr, May
Nitrogen, ammonia total [as N]weekly average≤ 6 mg/LJun–Oct
Nitrogen, ammonia total [as N]monthly average≤ 6 lb/dApr, May
Nitrogen, ammonia total [as N]monthly average≤ 4 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
E. coligeometric mean≤ 126 MPN/100mLMay–Sep
E. colidaily maximum≤ 406 MPN/100mLMay–Sep
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≤ 10 lb/dApr–Oct

How strict are these limits?

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

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Your permit document is the final word. As JSON: /api/v1/permits/OK0021512 · MCP: https://passage-data.com/mcp