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Chandler Municipal Authority

Sewage treatment plant, Chandler, Oklahoma. NPDES permit OK0027120, in force until Jul 31, 2028. Last 12 months: over a limit 27 times (last July 2026), 2 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 15 days after each period: form A monthly (17 values)
Renewal application due
Feb 2, 2028 · 180 days before expiry; your permit may set another date
Last report on file
August 2026
Oct 2024 – Sep 2025
23 values over a limit, 0 required values missing, 1 of 12 reports late

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

All 27 values over a limit
Period endingParameterReportedLimitOver by
October 2025Nitrogen, ammonia total [as N], monthly average20.43 mg/L≤ 6 mg/L241%
October 2025Nitrogen, ammonia total [as N], weekly average23.8 mg/L≤ 9 mg/L164%
November 2025BOD, 5-day, 20 deg. C, monthly average20.58 mg/L≤ 20 mg/L3%
November 2025E. coli, daily maximum14900 MPN/100mL≤ 2030 MPN/100mL634%
November 2025E. coli, geometric mean1308 MPN/100mL≤ 630 MPN/100mL108%
November 2025Solids, total suspended, monthly average34 mg/L≤ 30 mg/L13%
November 2025Solids, total suspended, weekly average71 mg/L≤ 45 mg/L58%
February 2026BOD, 5-day, 20 deg. C, monthly average20.09 mg/L≤ 20 mg/L0%
March 2026Solids, total suspended, monthly average36 mg/L≤ 30 mg/L20%
March 2026Solids, total suspended, weekly average70 mg/L≤ 45 mg/L56%
April 2026Nitrogen, ammonia total [as N], monthly average16.76 mg/L≤ 6 mg/L179%
April 2026Nitrogen, ammonia total [as N], weekly average19 mg/L≤ 9 mg/L111%
April 2026Solids, total suspended, monthly average45.66 mg/L≤ 30 mg/L52%
April 2026Solids, total suspended, weekly average67 mg/L≤ 45 mg/L49%
May 2026E. coli, daily maximum1700 MPN/100mL≤ 406 MPN/100mL319%
May 2026E. coli, geometric mean561.24 MPN/100mL≤ 126 MPN/100mL345%
May 2026Nitrogen, ammonia total [as N], monthly average20.06 mg/L≤ 6 mg/L234%
May 2026Nitrogen, ammonia total [as N], monthly average62.18 lb/d≤ 40 lb/d55%
May 2026Nitrogen, ammonia total [as N], weekly average23.6 mg/L≤ 9 mg/L162%
May 2026Solids, total suspended, monthly average61 mg/L≤ 30 mg/L103%
May 2026Solids, total suspended, weekly average65 mg/L≤ 45 mg/L44%
June 2026BOD, carbonaceous [5 day, 20 C], monthly average21.85 mg/L≤ 15 mg/L46%
June 2026BOD, carbonaceous [5 day, 20 C], weekly average31.18 mg/L≤ 22.5 mg/L39%
June 2026Nitrogen, ammonia total [as N], monthly average13.76 mg/L≤ 6 mg/L129%
June 2026Nitrogen, ammonia total [as N], weekly average15.7 mg/L≤ 9 mg/L74%
June 2026Solids, total suspended, weekly average54 mg/L≤ 45 mg/L20%
July 2026E. coli, daily maximum17300 MPN/100mL≤ 406 MPN/100mL4161%

Limits in force (27)

ParameterStatisticLimitMonths
Oxygen, dissolved [DO]instantaneous minimum≥ 6 mg/LApr, May
Oxygen, dissolved [DO]instantaneous minimum≥ 4 mg/LJan, Feb, Mar, Nov, Dec
Oxygen, dissolved [DO]instantaneous minimum≥ 5 mg/LJun–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≤ 133.4 lb/dJan, Feb, Mar, Nov, Dec
pHminimum≥ 6.5 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedweekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 200.2 lb/dall year
Nitrogen, ammonia total [as N]monthly average≤ 6 mg/LApr–Oct
Nitrogen, ammonia total [as N]weekly average≤ 9 mg/LApr–Oct
Nitrogen, ammonia total [as N]monthly average≤ 40 lb/dApr–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≤ 630 MPN/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
E. coligeometric mean≤ 126 MPN/100mLMay–Sep
E. colidaily maximum≤ 2030 MPN/100mLJan, Feb, Mar, Apr, Oct, Nov, Dec
E. colidaily maximum≤ 406 MPN/100mLMay–Sep
BOD, carbonaceous [5 day, 20 C]monthly average≤ 20 mg/LApr, May
BOD, carbonaceous [5 day, 20 C]monthly average≤ 15 mg/LJun–Oct
BOD, carbonaceous [5 day, 20 C]weekly average≤ 30 mg/LApr, May
BOD, carbonaceous [5 day, 20 C]weekly average≤ 22.5 mg/LJun–Oct
BOD, carbonaceous [5 day, 20 C]monthly average≤ 133.4 lb/dApr, May
BOD, carbonaceous [5 day, 20 C]monthly average≤ 100.1 lb/dJun–Oct

How strict are these limits?

Cited limits by parameter: Oklahoma'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/OK0027120 · MCP: https://passage-data.com/mcp