NORRIS STP (NORRIS WATER COMMISSION)
NPDES ID: TN0020630
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: 5 effluent violations.
Violations
May 31, 2026
Nitrogen, ammonia total [as N]
9% over limit
Discharged 1.63 mg/L against a permitted limit of 1.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
155% over limit
Discharged 7.66 mg/L against a permitted limit of 3 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2026
Nitrogen, ammonia total [as N]
304% over limit
Discharged 26.26 mg/L against a permitted limit of 6.5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
48% over limit
Discharged 3.62291997 kg/d against a permitted limit of 2.45159998 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
318% over limit
Discharged 13.6 mg/L against a permitted limit of 3.25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Nitrogen, ammonia total [as N]
17% over limit
Discharged 2.86246998 kg/d against a permitted limit of 2.45159998 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
230% over limit
Discharged 21.45 mg/L against a permitted limit of 6.5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
85% over limit
Discharged 6 mg/L against a permitted limit of 3.25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Nitrogen, ammonia total [as N]
49% over limit
Discharged 5.55241995 kg/d against a permitted limit of 3.72279997 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
April 30, 2025
SSO, Dry Weather
0% over limit
Discharged 0 occur/d against a permitted limit of 0 occur/d (MO TOTAL)
DMR, Monitor Only - Overdue
E. coli
0% over limit
Discharged 90 MPN/100mL against a permitted limit of 941 MPN/100mL (DAILY MX)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0.4086 kg/d against a permitted limit of 30.41799974 kg/d (WKLY AVG)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 10.9 mg/L against a permitted limit of 20 mg/L (DAILY MX)
DMR, Limited - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 7.5 mg/L against a permitted limit of 5 mg/L (INST MIN)
DMR, Limited - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 4.40379996 kg/d against a permitted limit of 0 kg/d (MO AVG)
DMR, Monitor Only - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 6.1 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 13.8 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 1 mg/L against a permitted limit of 40 mg/L (WKLY AVG)
DMR, Limited - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 8.6 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 3.73339204 kg/d against a permitted limit of 4.52600005 kg/d (ROLL AVG)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.282388 kg/d against a permitted limit of 3.72279997 kg/d (WKLY AVG)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 0.03 mg/L against a permitted limit of 0.07 mg/L (DAILY MX)
DMR, Limited - Overdue
SSO, Wet Weather
0% over limit
Discharged 0 occur/d against a permitted limit of 0 occur/d (MO TOTAL)
DMR, Monitor Only - Overdue
Solids, suspended percent removal
0% over limit
Discharged 93 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 8.03579993 kg/d against a permitted limit of 0 kg/d (DAILY MX)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 1.95219998 kg/d against a permitted limit of 22.69999981 kg/d (MO AVG)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 2.26999998 kg/d against a permitted limit of 7.71799994 kg/d (MO AVG)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 0.01 mg/L against a permitted limit of 0.04 mg/L (MO AVG)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 1.2 mg/L against a permitted limit of 3.25 mg/L (MO AVG)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 6.1 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Overdue
BOD, carbonaceous, percent removal
0% over limit
Discharged 97.5 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.26 mg/L against a permitted limit of 4.9 mg/L (WKLY AVG)
DMR, Limited - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 2.17919998 kg/d against a permitted limit of 0 kg/d (DAILY MX)
DMR, Monitor Only - Overdue
Solids, settleable
0% over limit
Discharged 0.0001 mg/L against a permitted limit of 0.001 mg/L (DAILY MX)
DMR, Limited - Overdue
Solids, suspended percent removal
0% over limit
Discharged 66.7 % against a permitted limit of 40 % (DAILY MN)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 3.1 mg/L against a permitted limit of 15 mg/L (WKLY AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 6 mg/L against a permitted limit of 45 mg/L (DAILY MX)
DMR, Limited - Overdue
pH
0% over limit
Discharged 8.1 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 1.31659999 kg/d against a permitted limit of 11.3499999 kg/d (WKLY AVG)
DMR, Limited - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 2.3 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.26 mg/L against a permitted limit of 6.5 mg/L (DAILY MX)
DMR, Limited - Overdue
BOD, carbonaceous, percent removal
0% over limit
Discharged 95.6 % against a permitted limit of 40 % (DAILY MN)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 15.52 MPN/100mL against a permitted limit of 126 MPN/100mL (GEO MEAN)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.4767 kg/d against a permitted limit of 2.45159998 kg/d (MO AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 3.3 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.287 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.117 MGD against a permitted limit of 0 MGD (MO AVG)
DMR, Monitor Only - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 0.90799999 kg/d against a permitted limit of 0 kg/d (MO AVG)
DMR, Monitor Only - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 0.84704401 kg/d against a permitted limit of 1.60952002 kg/d (ROLL AVG)
DMR, Limited - Overdue
pH
0% over limit
Discharged 7 SU against a permitted limit of 6 SU (DAILY MN)
DMR, Limited - Overdue
September 30, 2024
Nitrogen, total [as N]
0% over limit
Discharged 3.54119997 kg/d against a permitted limit of 0 kg/d (MO AVG)
DMR, Monitor Only - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 3.2 mg/L against a permitted limit of 15 mg/L (WKLY AVG)
DMR, Limited - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 22 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Chlorine, total residual
0% over limit
Discharged 0.03 mg/L against a permitted limit of 0.07 mg/L (DAILY MX)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.258 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 339 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Chlorine, total residual
0% over limit
Discharged 0.02 mg/L against a permitted limit of 0.04 mg/L (MO AVG)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 28.62 MPN/100mL against a permitted limit of 126 MPN/100mL (GEO MEAN)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 307.8 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
BOD, carbonaceous, percent removal
0% over limit
Discharged 98.5 % against a permitted limit of 40 % (DAILY MN)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.2 mg/L against a permitted limit of 1.5 mg/L (MO AVG)
DMR, Limited - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 13.5 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 0.95339999 kg/d against a permitted limit of 11.3499999 kg/d (WKLY AVG)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 1.31659999 kg/d against a permitted limit of 7.71799994 kg/d (MO AVG)
DMR, Limited - Overdue
Solids, suspended percent removal
0% over limit
Discharged 91.8 % against a permitted limit of 40 % (DAILY MN)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.04 mg/L against a permitted limit of 2.3 mg/L (WKLY AVG)
DMR, Limited - Overdue
Solids, settleable
0% over limit
Discharged 0.0001 mg/L against a permitted limit of 0.001 mg/L (DAILY MX)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.09 MGD against a permitted limit of 0 MGD (MO AVG)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 7.8 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 0.77016401 kg/d against a permitted limit of 1.60952002 kg/d (ROLL AVG)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.010442 kg/d against a permitted limit of 1.72519999 kg/d (WKLY AVG)
DMR, Limited - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 6 mg/L against a permitted limit of 5 mg/L (INST MIN)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 288 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 2.17919998 kg/d against a permitted limit of 22.69999981 kg/d (MO AVG)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 4.1 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Overdue
pH
0% over limit
Discharged 6.9 SU against a permitted limit of 6 SU (DAILY MN)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 80 MPN/100mL against a permitted limit of 941 MPN/100mL (DAILY MX)
DMR, Limited - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 5.40259995 kg/d against a permitted limit of 0 kg/d (DAILY MX)
DMR, Monitor Only - Overdue
SSO, Dry Weather
0% over limit
Discharged 0 occur/d against a permitted limit of 0 occur/d (MO TOTAL)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 217.6 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.094 MGD against a permitted limit of 0 MGD (MO AVG)
DMR, Monitor Only - Overdue
Nitrogen, total [as N]
0% over limit
Discharged 2.81480003 kg/d against a permitted limit of 4.52600005 kg/d (ROLL AVG)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.45 mg/L against a permitted limit of 3 mg/L (DAILY MX)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 4 mg/L against a permitted limit of 40 mg/L (WKLY AVG)
DMR, Limited - Overdue
BOD, carbonaceous, percent removal
0% over limit
Discharged 98.7 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 0.86259999 kg/d against a permitted limit of 0 kg/d (DAILY MX)
DMR, Monitor Only - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 3.2 mg/L against a permitted limit of 0 mg/L (MO AVG)
DMR, Monitor Only - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 0.86259999 kg/d against a permitted limit of 0 kg/d (MO AVG)
DMR, Monitor Only - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 4.8 mg/L against a permitted limit of 20 mg/L (DAILY MX)
DMR, Limited - Overdue
Solids, suspended percent removal
0% over limit
Discharged 96.4 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Overdue
SSO, Wet Weather
0% over limit
Discharged 0 occur/d against a permitted limit of 0 occur/d (MO TOTAL)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 15 mg/L against a permitted limit of 45 mg/L (DAILY MX)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0.99879999 kg/d against a permitted limit of 30.41799974 kg/d (WKLY AVG)
DMR, Limited - Overdue
pH
0% over limit
Discharged 7.2 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Overdue
Phosphorus, total [as P]
0% over limit
Discharged 3.4 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.231 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.058112 kg/d against a permitted limit of 1.13499999 kg/d (MO AVG)
DMR, Limited - Overdue
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (24 days ago)