CHAPEL HILL MHC WWTF
NPDES ID: MO0086525
E — SNC: Effluent violation (monthly average limit)
The facility discharged more of a pollutant than its permit allows, based on a monthly average.
Violations
March 31, 2026
Nitrogen, ammonia total [as N]
287% over limit
Discharged 12 mg/L against a permitted limit of 3.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
E. coli
1075% over limit
Discharged 2419.6 MPN/100mL against a permitted limit of 206 MPN/100mL (MO AVG)
DMR, Limited - Numeric Violation
E. coli
135% over limit
Discharged 2419.6 MPN/100mL against a permitted limit of 1030 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
218% over limit
Discharged 9.21 mg/L against a permitted limit of 2.9 mg/L (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrogen, ammonia total [as N]
309% over limit
Discharged 8.18 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2025
Nitrogen, ammonia total [as N]
287% over limit
Discharged 12 mg/L against a permitted limit of 3.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2024
Nitrogen, ammonia total [as N]
64% over limit
Discharged 4.76 mg/L against a permitted limit of 2.9 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Nitrogen, ammonia total [as N]
30% over limit
Discharged 1.95 mg/L against a permitted limit of 1.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (4 days ago)