PORTIA WASTEWATER TREATMENT PLANT
NPDES ID: AR0040355
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: 11 effluent violations.
Violations
May 31, 2026
Solids, total suspended
33% over limit
Discharged 40 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
91% over limit
Discharged 57.4 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
28% over limit
Discharged 57.4 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 200 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
10% over limit
Discharged 1.8 mg/L against a permitted limit of 2 mg/L (INST MIN)
DMR, Limited - Numeric Violation
April 30, 2026
BOD, 5-day, 20 deg. C
39% over limit
Discharged 41.7 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
7% over limit
Discharged 1.86 mg/L against a permitted limit of 2 mg/L (INST MIN)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 1000 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 2000 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Solids, total suspended
3% over limit
Discharged 31 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 2000 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 1000 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
February 28, 2026
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 2000 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 1000 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
January 31, 2026
Chlorine, total residual
633% over limit
Discharged 2.2 mg/L against a permitted limit of 0.3 mg/L (INST MAX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
253% over limit
Discharged 106 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
379% over limit
Discharged 48.94119959 kg/d against a permitted limit of 10.21499991 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
136% over limit
Discharged 106 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
1049% over limit
Discharged 517 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 2000 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 1000 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
Solids, total suspended
1623% over limit
Discharged 517 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 1000 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 2000 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
November 30, 2025
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 1000 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 2000 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
35% over limit
Discharged 1.31 mg/L against a permitted limit of 2 mg/L (INST MIN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
221% over limit
Discharged 96.3 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
114% over limit
Discharged 96.3 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Coliform, fecal general
140% over limit
Discharged 2400 MPN/100mL against a permitted limit of 1000 MPN/100mL (30DA GEO)
DMR, Limited - Overdue
Coliform, fecal general
140% over limit
Discharged 2400 MPN/100mL against a permitted limit of 1000 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
Overflow volume [SS0 volume, CSO volume]
0% over limit
Discharged 0 gal against a permitted limit of 0 gal (MO TOTAL)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
123% over limit
Discharged 66.9 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
123% over limit
Discharged 66.9 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.004 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
Coliform, fecal general
20% over limit
Discharged 2400 MPN/100mL against a permitted limit of 2000 MPN/100mL (7 DA GEO)
DMR, Limited - Overdue
Coliform, fecal general
20% over limit
Discharged 2400 MPN/100mL against a permitted limit of 2000 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.003 MGD against a permitted limit of 0 MGD (MO AVG)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 0.1816 kg/d against a permitted limit of 10.21499991 kg/d (MO AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 0.5902 kg/d against a permitted limit of 10.21499991 kg/d (MO AVG)
DMR, Limited - Overdue
pH
0% over limit
Discharged 7.54 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 18.5 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
Oxygen, dissolved [DO]
Limit violation
Discharged 1 mg/L against a permitted limit of 2 mg/L (INST MIN)
DMR, Limited - Overdue
Oxygen, dissolved [DO]
Limit violation
Discharged 1 mg/L against a permitted limit of 2 mg/L (INST MIN)
DMR, Limited - Numeric Violation
Overflows
0% over limit
Discharged 0 occur/d against a permitted limit of 0 occur/d (MO TOTAL)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 18.5 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Overdue
pH
0% over limit
Discharged 7.54 SU against a permitted limit of 6 SU (MINIMUM)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
49% over limit
Discharged 66.9 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
49% over limit
Discharged 66.9 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
243% over limit
Discharged 1.03 mg/L against a permitted limit of 0.3 mg/L (INST MAX)
DMR, Limited - Overdue
Chlorine, total residual
243% over limit
Discharged 1.03 mg/L against a permitted limit of 0.3 mg/L (INST MAX)
DMR, Limited - Numeric Violation
September 30, 2025
Oxygen, dissolved [DO]
30% over limit
Discharged 1.4 mg/L against a permitted limit of 2 mg/L (INST MIN)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 200 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Chlorine, total residual
273% over limit
Discharged 1.12 mg/L against a permitted limit of 0.3 mg/L (INST MAX)
DMR, Limited - Numeric Violation
August 31, 2025
BOD, 5-day, 20 deg. C
0% over limit
Discharged 19.4 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
pH
0% over limit
Discharged 7.39 SU against a permitted limit of 6 SU (MINIMUM)
DMR, Limited - Overdue
Overflows
0% over limit
Discharged 0 occur/d against a permitted limit of 0 occur/d (MO TOTAL)
DMR, Monitor Only - Overdue
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Overdue
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.007 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 7.39 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Overdue
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 200 MPN/100mL (30DA GEO)
DMR, Limited - Overdue
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 200 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
Chlorine, total residual
0% over limit
Discharged 0.18 mg/L against a permitted limit of 0.3 mg/L (INST MAX)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0.09534 kg/d against a permitted limit of 10.21499991 kg/d (MO AVG)
DMR, Limited - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 2.99 mg/L against a permitted limit of 2 mg/L (INST MIN)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 0.227 kg/d against a permitted limit of 10.21499991 kg/d (MO AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 19.4 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 8.5 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Overdue
Overflow volume [SS0 volume, CSO volume]
0% over limit
Discharged 0 gal against a permitted limit of 0 gal (MO TOTAL)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 8.5 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 0.004 MGD against a permitted limit of 0 MGD (MO AVG)
DMR, Monitor Only - Overdue
July 31, 2025
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 200 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
June 30, 2025
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 200 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
May 31, 2025
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 200 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
December 31, 2024
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 1000 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 2000 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
November 30, 2024
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 1000 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 2000 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
September 30, 2024
BOD, 5-day, 20 deg. C
0% over limit
Discharged 16.9 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.003 MGD against a permitted limit of 0 MGD (MO AVG)
DMR, Monitor Only - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 0.23608 kg/d against a permitted limit of 10.21499991 kg/d (MO AVG)
DMR, Limited - Overdue
Chlorine, total residual
147% over limit
Discharged 0.74 mg/L against a permitted limit of 0.3 mg/L (INST MAX)
DMR, Limited - Overdue
Chlorine, total residual
147% over limit
Discharged 0.74 mg/L against a permitted limit of 0.3 mg/L (INST MAX)
DMR, Limited - Numeric Violation
Coliform, fecal general
0% over limit
Discharged 32 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 16.9 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
Overflow volume [SS0 volume, CSO volume]
0% over limit
Discharged 0 gal against a permitted limit of 0 gal (MO TOTAL)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 10 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
Overflows
0% over limit
Discharged 0 occur/d against a permitted limit of 0 occur/d (MO TOTAL)
DMR, Monitor Only - Overdue
Coliform, fecal general
0% over limit
Discharged 32 MPN/100mL against a permitted limit of 200 MPN/100mL (30DA GEO)
DMR, Limited - Overdue
pH
0% over limit
Discharged 7.66 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 10 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0.14074 kg/d against a permitted limit of 10.21499991 kg/d (MO AVG)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.004 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 7.66 SU against a permitted limit of 6 SU (MINIMUM)
DMR, Limited - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 3.02 mg/L against a permitted limit of 2 mg/L (INST MIN)
DMR, Limited - Overdue
August 31, 2024
pH
0% over limit
Discharged 7.23 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Overdue
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Overdue
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.003 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 200 MPN/100mL (30DA GEO)
DMR, Limited - Overdue
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 200 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
Overflow volume [SS0 volume, CSO volume]
0% over limit
Discharged 0 gal against a permitted limit of 0 gal (MO TOTAL)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 4.5 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 0.3 mg/L against a permitted limit of 0.3 mg/L (INST MAX)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.002 MGD against a permitted limit of 0 MGD (MO AVG)
DMR, Monitor Only - Overdue
Solids, total suspended
0% over limit
Discharged 4.5 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 6.2 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 0.05448 kg/d against a permitted limit of 10.21499991 kg/d (MO AVG)
DMR, Limited - Overdue
Oxygen, dissolved [DO]
0% over limit
Discharged 3.9 mg/L against a permitted limit of 2 mg/L (INST MIN)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0.04086 kg/d against a permitted limit of 10.21499991 kg/d (MO AVG)
DMR, Limited - Overdue
BOD, 5-day, 20 deg. C
0% over limit
Discharged 6.2 mg/L against a permitted limit of 45 mg/L (7 DA AVG)
DMR, Limited - Overdue
pH
0% over limit
Discharged 7.23 SU against a permitted limit of 6 SU (MINIMUM)
DMR, Limited - Overdue
Overflows
0% over limit
Discharged 0 occur/d against a permitted limit of 0 occur/d (MO TOTAL)
DMR, Monitor Only - Overdue
July 31, 2024
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 400 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Coliform, fecal general
Limit violation
Discharged 2420 MPN/100mL against a permitted limit of 200 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)