YAMPA WWTF

NPDES ID: COG591185

E — SNC: Effluent violation (monthly average limit)

The facility discharged more of a pollutant than its permit allows, based on a monthly average.

This quarter: 12 effluent violations.

Violations

June 30, 2026

Solids, suspended percent removal

271% over limit

Discharged 44.3 % against a permitted limit of 85 % (MO AV MN)

DMR, Limited - Numeric Violation

Solids, total suspended

13% over limit

Discharged 34 mg/L against a permitted limit of 30 mg/L (30DA AVG)

DMR, Limited - Numeric Violation

May 31, 2026

BOD, 5-day, 20 deg. C

7% over limit

Discharged 48 mg/L against a permitted limit of 45 mg/L (DAILY MX)

DMR, Limited - Numeric Violation

Solids, total suspended

110% over limit

Discharged 63 mg/L against a permitted limit of 30 mg/L (30DA AVG)

DMR, Limited - Numeric Violation

Solids, total suspended

69% over limit

Discharged 76 mg/L against a permitted limit of 45 mg/L (MX 7D AV)

DMR, Limited - Numeric Violation

Solids, suspended percent removal

180% over limit

Discharged 58 % against a permitted limit of 85 % (MO AV MN)

DMR, Limited - Numeric Violation

BOD, 5-day, 20 deg. C

50% over limit

Discharged 45 mg/L against a permitted limit of 30 mg/L (30DA AVG)

DMR, Limited - Numeric Violation

April 30, 2026

BOD, 5-day, 20 deg. C

50% over limit

Discharged 45 mg/L against a permitted limit of 30 mg/L (30DA AVG)

DMR, Limited - Numeric Violation

BOD, 5-day, percent removal

95% over limit

Discharged 70.8 % against a permitted limit of 85 % (MO AV MN)

DMR, Limited - Numeric Violation

Solids, suspended percent removal

147% over limit

Discharged 63 % against a permitted limit of 85 % (MO AV MN)

DMR, Limited - Numeric Violation

Solids, total suspended

13% over limit

Discharged 51 mg/L against a permitted limit of 45 mg/L (MX 7D AV)

DMR, Limited - Numeric Violation

Solids, total suspended

70% over limit

Discharged 51 mg/L against a permitted limit of 30 mg/L (30DA AVG)

DMR, Limited - Numeric Violation

February 28, 2026

Nitrogen, ammonia total [as N]

23% over limit

Discharged 42.9 mg/L against a permitted limit of 35 mg/L (30DA AVG)

DMR, Limited - Numeric Violation

January 31, 2026

Carbon, tot organic [TOC]

0% over limit

Discharged 0 mg/L against a permitted limit of 0 mg/L (30DA AVG)

DMR, Monitor Only - Overdue

Carbon, tot organic [TOC]

0% over limit

Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)

DMR, Monitor Only - Overdue

October 31, 2025

Chlorine, total residual

33% over limit

Discharged 0.4 mg/L against a permitted limit of 0.3 mg/L (30DA AVG)

DMR, Limited - Numeric Violation

BOD, 5-day, percent removal

67% over limit

Discharged 75 % against a permitted limit of 85 % (MO AV MN)

DMR, Limited - Numeric Violation

Solids, suspended percent removal

27% over limit

Discharged 81 % against a permitted limit of 85 % (MO AV MN)

DMR, Limited - Numeric Violation

Chlorine, total residual

67% over limit

Discharged 0.5 mg/L against a permitted limit of 0.3 mg/L (INST MAX)

DMR, Limited - Numeric Violation

September 30, 2025

Chlorine, total residual

67% over limit

Discharged 0.5 mg/L against a permitted limit of 0.3 mg/L (INST MAX)

DMR, Limited - Numeric Violation

Chlorine, total residual

67% over limit

Discharged 0.5 mg/L against a permitted limit of 0.3 mg/L (30DA AVG)

DMR, Limited - Numeric Violation

First flagged

April 14, 2026 (4 months ago)

Last confirmed

August 16, 2026 (yesterday)