OCWC HIDDEN RIDGE ESTATES WWTP
NPDES ID: MO0118630
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: 2 effluent violations.
Violations
June 30, 2026
Phosphorus, total [as P]
64% over limit
Discharged 0.82 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
223% over limit
Discharged 4.2 mg/L against a permitted limit of 1.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Phosphorus, total [as P]
108% over limit
Discharged 1.04 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Phosphorus, total [as P]
414% over limit
Discharged 2.57 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
5% over limit
Discharged 10.5 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli
20% over limit
Discharged 248 MPN/100mL against a permitted limit of 206 MPN/100mL (30DA GM)
DMR, Limited - Numeric Violation
September 30, 2025
Nitrogen, ammonia total [as N]
580% over limit
Discharged 8.84 mg/L against a permitted limit of 1.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
64% over limit
Discharged 8.84 mg/L against a permitted limit of 5.4 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
384% over limit
Discharged 2.42 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Phosphorus, total [as P]
458% over limit
Discharged 2.79 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2025
Phosphorus, total [as P]
230% over limit
Discharged 1.65 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2024
Solids, total suspended
10% over limit
Discharged 22 mg/L against a permitted limit of 20 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
632% over limit
Discharged 3.66 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
18% over limit
Discharged 11.75 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
47% over limit
Discharged 22 mg/L against a permitted limit of 15 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Nitrogen, ammonia total [as N]
146% over limit
Discharged 13.3 mg/L against a permitted limit of 5.4 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
E. coli
145% over limit
Discharged 505.6 MPN/100mL against a permitted limit of 206 MPN/100mL (30DA GM)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
923% over limit
Discharged 13.3 mg/L against a permitted limit of 1.3 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)