NPDES OK0026018 · Clean Water Act
CHICKASHA MUNICIPAL AUTHORITY, Chickasha, OK: NPDES OK0026018 discharge permit, effluent exceedances, inspections, penalties
CHICKASHA MUNICIPAL AUTHORITY, Chickasha, Oklahoma: Individual permit OK0026018, held by Chickasha Municipal Authority; Publicly owned treatment works; Administratively continued; issued December 23, 2015, term to December 31, 2020, by ODEQ; discharges to 310820010010_00 Washita River/Lake Texoma; Sewage Treatment Facilities.
- pH: 4 limits, 81 violations of any kind, 17 effluent exceedances, latest September 30, 2014.
- Nitrogen, ammonia total [as N]: 9 limits, 127 violations of any kind, 16 effluent exceedances, latest March 31, 2026, largest 83% over the limit.
- BOD, 5-day, 20 deg. C: 3 limits, 74 violations of any kind, 8 effluent exceedances, latest November 30, 2019, largest 111% over the limit.
- Coliform, fecal general: 0 limits, 13 violations of any kind, 7 effluent exceedances, latest September 30, 2014, largest 59,900% over the limit.
- E. coli: 2 limits, 11 violations of any kind, 5 effluent exceedances, latest August 31, 2018, largest 1,149% over the limit.
- Chlorine, total residual: 1 limit, 22 violations of any kind, 1 effluent exceedance, latest June 30, 2014, largest 1% over the limit.
- Oxygen, dissolved [DO]: 1 limit, 21 violations of any kind, 1 effluent exceedance, latest April 30, 2010, largest 10% over the limit.
- Coliform, total general: 0 limits, 1 violation of any kind, 1 effluent exceedance, latest January 31, 2001, largest 160% over the limit.
- Solids, total suspended: 3 limits, 93 violations of any kind.
- Flow, in conduit or thru treatment plant: 2 limits, 40 violations of any kind.
- Arsenic, dry weight: 5 limits, 20 violations of any kind.
- Nickel, sludge, total, dry weight [as Ni]: 5 limits, 20 violations of any kind.
- Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas: 1 limit, 14 violations of any kind.
- NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas: 1 limit, 14 violations of any kind.
- NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas: 1 limit, 14 violations of any kind.
- LC50 Static Renewal 48Hr Acute Daphnia pulex: 1 limit, 13 violations of any kind.
- %Mortality Static Renewal 7Day Chronic Pimephales Promelas: 1 limit, 13 violations of any kind.
- Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia: 1 limit, 13 violations of any kind.
- NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia: 1 limit, 13 violations of any kind.
- NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia: 1 limit, 13 violations of any kind.
- Coef Of Var Static Renewal 7Day Chronic Pimephales promelas: 1 limit, 13 violations of any kind.
- Lead, total [as Pb]: 0 limits, 13 violations of any kind.
- Selenium, total [as Se]: 0 limits, 13 violations of any kind.
- Selenium, dry weight: 3 limits, 12 violations of any kind.
- Copper, dry weight: 3 limits, 12 violations of any kind.
- Cadmium, dry weight: 3 limits, 12 violations of any kind.
- Molybdenum, sludge, total, dry weight [as Mo]: 3 limits, 12 violations of any kind.
- Zinc, sludge, total, dry weight [as Zn]: 3 limits, 12 violations of any kind.
- Lead, sludge, total, dry weight [as Pb]: 3 limits, 12 violations of any kind.
- Mercury, sludge, total, dry weight [as Hg]: 3 limits, 12 violations of any kind.
- BOD, carbonaceous [5 day, 20 C]: 3 limits, 12 violations of any kind.
- LC50 Static Renewal 48Hr Acute Pimephales promelas: 1 limit, 12 violations of any kind.
- Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia: 1 limit, 12 violations of any kind.
- LC50 Pass/Fail Static Renewal 48Hr Acute Daphnia Pulex: 1 limit, 11 violations of any kind.
- LC50 Static Renewal 48Hr Acute Pimephales promelas: 1 limit, 11 violations of any kind.
- % Mortality Static Renewal 48 Hr Pimephales promelas or use TJA6C: 1 limit, 11 violations of any kind.
- %Mortality 7Day Chronic Ceriodaphnia dubia: 1 limit, 11 violations of any kind.
- Pass/Fail Static Renewal 7Day Chronic Pimephales promelas: 1 limit, 10 violations of any kind.
- Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia: 1 limit, 9 violations of any kind.
- %Mortality Static Renewal 48Hr Acute Daphnia Pulex: 1 limit, 9 violations of any kind.
- Chromium, sludge, total, dry weight [as Cr]: 2 limits, 8 violations of any kind.
- Level of pathogen requirements achieved: 2 limits, 8 violations of any kind.
- Description of pathogen option used: 2 limits, 8 violations of any kind.
- Vector attraction reduction alternative used: 2 limits, 8 violations of any kind.
- Polychlorinated biphenyls [PCBs]: 1 limit, 7 violations of any kind.
- Toxicity characteristic leaching procedure: 1 limit, 7 violations of any kind.
- Annual sludge production, total: 1 limit, 7 violations of any kind.
- Annual amt sludge disposed in landfill: 1 limit, 7 violations of any kind.
- Cyanide, total [as CN]: 0 limits, 7 violations of any kind.
- Ann. amt sludge disposed by other method: 1 limit, 6 violations of any kind.
- Annual amt of sludge incinerated: 1 limit, 6 violations of any kind.
- Annual amount of sludge land applied: 1 limit, 6 violations of any kind.
- Annual amt. sludge disposed surface unit: 1 limit, 6 violations of any kind.
- Annual amt sludge transported interstate: 1 limit, 6 violations of any kind.
- Compliance w/part 258 sludge requirement: 1 limit, 6 violations of any kind.
- Unit w/liner/leachate collection system: 1 limit, 4 violations of any kind.
- Unit boundary to property line distance: 1 limit, 4 violations of any kind.
- Pollutant table from 503.13: 1 limit, 4 violations of any kind.
- Hardness, total [as CaCO3]: 0 limits, 4 violations of any kind.
- Cadmium, total [as Cd]: 0 limits, 4 violations of any kind.
- June 19, 2026: Letter of Violation/ Warning Letter (State).
- March 26, 2026: Letter of Violation/ Warning Letter (State).
- February 17, 2026: Evaluation (S).
- February 10, 2026: Evaluation (S).
- January 22, 2026: Evaluation (S).
- February 24, 2025: Effluent Violations - Unapproved Bypass (ST6).
- February 21, 2025: Effluent Violations - Unapproved Bypass (ST6).
- August 31, 2023: Effluent Violations - Unapproved Bypass (ST6).
- August 29, 2023: Effluent Violations - Unapproved Bypass (ST6).
- May 22, 2021: Effluent Violations - Unapproved Bypass (ST6).
- May 20, 2021: Effluent Violations - Unapproved Bypass (ST6).
- May 16, 2021: Effluent Violations - Unapproved Bypass (ST6).
- December 2, 2020: Effluent Violations - Unauthorized Discharge (ST6).
- January 18, 2020: Effluent Violations - Unauthorized Discharge (ST6).
- November 19, 2019: Effluent Violations - Unapproved Bypass (ST6).
- November 18, 2019: Effluent Violations - Unauthorized Discharge (ST6).
- March 22, 2018: Permit Violations - Violation Specified in Comment (ST6).
- March 13, 2018: Permit Violations - Violation Specified in Comment (ST6).
- December 6, 2017: Management Practice Violations - Improper Operation and Maintenance (ST6).
- May 27, 2017: Effluent Violations - Unapproved Bypass (ST6).
- May 23, 2017: Effluent Violations - Unapproved Bypass (ST6).
- May 22, 2017: Effluent Violations - Unapproved Bypass (ST6).
- May 21, 2017: Effluent Violations - Unapproved Bypass (ST6).
- April 6, 2017: Effluent Violations - Unauthorized Discharge (ST6).
- April 4, 2017: Permit Violations - Violation Specified in Comment (ST6).
- March 28, 2017: Effluent Violations - Unauthorized Discharge (ST6).
- March 14, 2017: Effluent Violations - Unauthorized Discharge (ST6).
Oklahoma holds 197 Publicly owned treatment works coverages of this permit type in EPA’s file; 45 were issued before OK0026018.
Coverages issued nearest OK0026018
- 2015-04-15: MIDWEST CITY, CITY OF - NORTH, Midwest City: OK0026841, held by Midwest City, City of (Northside)
- 2015-05-11: EL RENO MUNICIPAL AUTHORITY, El Reno: OK0100382, held by El Reno Municipal Authority
- 2015-05-15: GUTHRIE, Guthrie: OK0027715, held by Guthrie PWA
- 2015-05-20: MCALESTER, CITY OF - WEST PLANT, Mcalester: OK0026093, held by McAlester City of (West Plant)
- 2015-12-07: NEWCASTLE PUBLIC WORKS AUTH., Newcastle: OK0028614, held by Newcastle PWA
- 2015-12-29: CHOCTAW CO. RW & SD #1, Grant: OK0037826, held by Choctaw Co. RW & SD #1-Grant
- 2016-01-06: MCALESTER, CITY OF - EAST PLANT, Mcalester: OK0026107, held by McAlester WWTF-East Plant
- 2016-01-14: CHICKASAW TRIBAL UTILITIES AUTHORITY, Thackerville: OK0045721, held by Chickasaw Tribal Utilities Authority-Winstar WWT
- 2016-02-04: HENRYETTA, CITY OF, Henryetta: OK0028266, held by Henryetta, City of
- 2016-02-18: DUNCAN PUBLIC UTILITIES AUTH, Duncan: OK0026638, held by Duncan PWA
CHICKASHA MUNICIPAL AUTHORITY among its neighbors
3 discharge permits are in the Otter Creek-Washita River subwatershed (HUC 111303020912); OK0026018 is one. Its county: 5, 1 major; OK0026018 is major permit.
Other permits in the Otter Creek-Washita River subwatershed (HUC 111303020912)
- AE4755 FALCON RIDGE PH 2, Chickasha: OKR10F02X, minor, term to 2027-02-16
- LIVINGSTON MACHINERY COMPANY, Chickasha: OK0045501
Identity
| Facility | CHICKASHA MUNICIPAL AUTHORITY |
|---|---|
| Permittee | Chickasha Municipal Authority |
| NPDES ID | OK0026018 |
| Status | Administratively continued |
| Type | Individual permit |
| Class | Major |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | December 23, 2015 |
| Expires | December 31, 2020 |
| Agency | ODEQ |
| Address | Chickasha, OK 73018 |
| Receiving water | 310820010010_00 Washita River/Lake Texoma |
| Subwatershed | Otter Creek-Washita River (HUC 111303020912) |
| Program components on file | Biosolids, POTW, Pretreatment |
| NAICS | 221320 – Sewage Treatment Facilities |
| SIC | 4952 – Sewerage Systems |
NPDES OK0026018: effluent limits and exceedances
CHICKASHA MUNICIPAL AUTHORITY (NPDES OK0026018): 72 pollutants on file, 56 limited; 69 with a violation of any kind, 8 with an exceedance.
The 60 with the most exceedances of the 72 on file for NPDES OK0026018. How exceedances are counted.
| Pollutant | Limits | Violations | Exceedances | Latest | Largest, as filed |
|---|---|---|---|---|---|
| pH | 4 | 81 | 17 | September 30, 2014 | |
| Nitrogen, ammonia total [as N] | 9 | 127 | 16 | March 31, 2026 | 83% over the limit |
| BOD, 5-day, 20 deg. C | 3 | 74 | 8 | November 30, 2019 | 111% over the limit |
| Coliform, fecal general | 0 | 13 | 7 | September 30, 2014 | 59,900% over the limit |
| E. coli | 2 | 11 | 5 | August 31, 2018 | 1,149% over the limit |
| Chlorine, total residual | 1 | 22 | 1 | June 30, 2014 | 1% over the limit |
| Oxygen, dissolved [DO] | 1 | 21 | 1 | April 30, 2010 | 10% over the limit |
| Coliform, total general | 0 | 1 | 1 | January 31, 2001 | 160% over the limit |
| Solids, total suspended | 3 | 93 | 0 | ||
| Flow, in conduit or thru treatment plant | 2 | 40 | 0 | ||
| Arsenic, dry weight | 5 | 20 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 5 | 20 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Pimephales promelas | 1 | 14 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Pimephales promelas | 1 | 14 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Pimephales promelas | 1 | 14 | 0 | ||
| LC50 Static Renewal 48Hr Acute Daphnia pulex | 1 | 13 | 0 | ||
| %Mortality Static Renewal 7Day Chronic Pimephales Promelas | 1 | 13 | 0 | ||
| Low Flow Pass/Fail Survival Test Static Renewal 7 Day Chronic Ceriodaphnia dubia | 1 | 13 | 0 | ||
| NOEC Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 1 | 13 | 0 | ||
| NOEC Sub-Lethal Static Renewal 7 Day Chronic Ceriodaphnia dubia | 1 | 13 | 0 | ||
| Coef Of Var Static Renewal 7Day Chronic Pimephales promelas | 1 | 13 | 0 | ||
| Lead, total [as Pb] | 0 | 13 | 0 | ||
| Selenium, total [as Se] | 0 | 13 | 0 | ||
| Selenium, dry weight | 3 | 12 | 0 | ||
| Copper, dry weight | 3 | 12 | 0 | ||
| Cadmium, dry weight | 3 | 12 | 0 | ||
| Molybdenum, sludge, total, dry weight [as Mo] | 3 | 12 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 3 | 12 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 3 | 12 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 3 | 12 | 0 | ||
| BOD, carbonaceous [5 day, 20 C] | 3 | 12 | 0 | ||
| LC50 Static Renewal 48Hr Acute Pimephales promelas | 1 | 12 | 0 | ||
| Coef Of Var Static Renewal 7Day Chronic Ceriodaphnia dubia | 1 | 12 | 0 | ||
| LC50 Pass/Fail Static Renewal 48Hr Acute Daphnia Pulex | 1 | 11 | 0 | ||
| LC50 Static Renewal 48Hr Acute Pimephales promelas | 1 | 11 | 0 | ||
| % Mortality Static Renewal 48 Hr Pimephales promelas or use TJA6C | 1 | 11 | 0 | ||
| %Mortality 7Day Chronic Ceriodaphnia dubia | 1 | 11 | 0 | ||
| Pass/Fail Static Renewal 7Day Chronic Pimephales promelas | 1 | 10 | 0 | ||
| Pass/Fail Static Renewal 7 Day Chronic Ceriodaphnia dubia | 1 | 9 | 0 | ||
| %Mortality Static Renewal 48Hr Acute Daphnia Pulex | 1 | 9 | 0 | ||
| Chromium, sludge, total, dry weight [as Cr] | 2 | 8 | 0 | ||
| Level of pathogen requirements achieved | 2 | 8 | 0 | ||
| Description of pathogen option used | 2 | 8 | 0 | ||
| Vector attraction reduction alternative used | 2 | 8 | 0 | ||
| Polychlorinated biphenyls [PCBs] | 1 | 7 | 0 | ||
| Toxicity characteristic leaching procedure | 1 | 7 | 0 | ||
| Annual sludge production, total | 1 | 7 | 0 | ||
| Annual amt sludge disposed in landfill | 1 | 7 | 0 | ||
| Cyanide, total [as CN] | 0 | 7 | 0 | ||
| Ann. amt sludge disposed by other method | 1 | 6 | 0 | ||
| Annual amt of sludge incinerated | 1 | 6 | 0 | ||
| Annual amount of sludge land applied | 1 | 6 | 0 | ||
| Annual amt. sludge disposed surface unit | 1 | 6 | 0 | ||
| Annual amt sludge transported interstate | 1 | 6 | 0 | ||
| Compliance w/part 258 sludge requirement | 1 | 6 | 0 | ||
| Unit w/liner/leachate collection system | 1 | 4 | 0 | ||
| Unit boundary to property line distance | 1 | 4 | 0 | ||
| Pollutant table from 503.13 | 1 | 4 | 0 | ||
| Hardness, total [as CaCO3] | 0 | 4 | 0 | ||
| Cadmium, total [as Cd] | 0 | 4 | 0 |
NPDES OK0026018: inspections, violations and enforcement
NPDES OK0026018: 22 single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| February 24, 2025 | Effluent Violations - Unapproved Bypass | ST6 |
| February 21, 2025 | Effluent Violations - Unapproved Bypass | ST6 |
| August 31, 2023 | Effluent Violations - Unapproved Bypass | ST6 |
| August 29, 2023 | Effluent Violations - Unapproved Bypass | ST6 |
| May 22, 2021 | Effluent Violations - Unapproved Bypass | ST6 |
| May 20, 2021 | Effluent Violations - Unapproved Bypass | ST6 |
| May 16, 2021 | Effluent Violations - Unapproved Bypass | ST6 |
| December 2, 2020 | Effluent Violations - Unauthorized Discharge | ST6 |
| January 18, 2020 | Effluent Violations - Unauthorized Discharge | ST6 |
| November 19, 2019 | Effluent Violations - Unapproved Bypass | ST6 |
| November 18, 2019 | Effluent Violations - Unauthorized Discharge | ST6 |
| March 22, 2018 | Permit Violations - Violation Specified in Comment | ST6 |
| March 13, 2018 | Permit Violations - Violation Specified in Comment | ST6 |
| December 6, 2017 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| May 27, 2017 | Effluent Violations - Unapproved Bypass | ST6 |
| May 23, 2017 | Effluent Violations - Unapproved Bypass | ST6 |
| May 22, 2017 | Effluent Violations - Unapproved Bypass | ST6 |
| May 21, 2017 | Effluent Violations - Unapproved Bypass | ST6 |
| April 6, 2017 | Effluent Violations - Unauthorized Discharge | ST6 |
| April 4, 2017 | Permit Violations - Violation Specified in Comment | ST6 |
| March 28, 2017 | Effluent Violations - Unauthorized Discharge | ST6 |
| March 14, 2017 | Effluent Violations - Unauthorized Discharge | ST6 |
NPDES OK0026018: 3 inspections
| Date | What EPA recorded | Agency |
|---|---|---|
| February 17, 2026 | Evaluation | S |
| February 10, 2026 | Evaluation | S |
| January 22, 2026 | Evaluation | S |
NPDES OK0026018: 2 informal enforcement actions
| Date | What EPA recorded | Agency |
|---|---|---|
| June 19, 2026 | Letter of Violation/ Warning Letter | State |
| March 26, 2026 | Letter of Violation/ Warning Letter | State |
NPDES OK0026018 (CHICKASHA MUNICIPAL AUTHORITY): no formal enforcement action on file.
Watch NPDES OK0026018
NPDES OK0026018: one email when its EPA record changes — $99/month.
Permits near NPDES OK0026018
NPDES OK0026018: 72 pollutant rows, 27 dated events; ICIS-NPDES download, loaded October 14, 2026.