PORT ROYAL STP
NPDES ID: PA0020648
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: 6 effluent violations.
Violations
May 31, 2026
Chlorine, total residual
39% over limit
Discharged 2.23 mg/L against a permitted limit of 1.6 mg/L (INST MAX)
DMR, Limited - Numeric Violation
Chlorine, total residual
12% over limit
Discharged 0.56 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2026
BOD, carbonaceous [5 day, 20 C]
20% over limit
Discharged 30 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
22% over limit
Discharged 55 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
103% over limit
Discharged 81.3 mg/L against a permitted limit of 40 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
1103% over limit
Discharged 120330 MPN/100mL against a permitted limit of 10000 MPN/100mL (INST MAX)
DMR, Limited - Numeric Violation
March 31, 2026
Chlorine, total residual
18% over limit
Discharged 0.59 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
610% over limit
Discharged 161.16999865 kg/d against a permitted limit of 22.69999981 kg/d (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Chlorine, total residual
40% over limit
Discharged 0.7 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Coliform, fecal general
1% over limit
Discharged 10112 MPN/100mL against a permitted limit of 10000 MPN/100mL (INST MAX)
DMR, Limited - Numeric Violation
Chlorine, total residual
18% over limit
Discharged 1.89 mg/L against a permitted limit of 1.6 mg/L (INST MAX)
DMR, Limited - Numeric Violation
November 30, 2025
Chlorine, total residual
40% over limit
Discharged 0.7 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
2320% over limit
Discharged 241960 MPN/100mL against a permitted limit of 10000 MPN/100mL (INST MAX)
DMR, Limited - Numeric Violation
Coliform, fecal general
64% over limit
Discharged 3289 MPN/100mL against a permitted limit of 2000 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
Chlorine, total residual
144% over limit
Discharged 3.9 mg/L against a permitted limit of 1.6 mg/L (INST MAX)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
105% over limit
Discharged 82.1 mg/L against a permitted limit of 40 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Chlorine, total residual
26% over limit
Discharged 0.63 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Chlorine, total residual
6% over limit
Discharged 1.7 mg/L against a permitted limit of 1.6 mg/L (INST MAX)
DMR, Limited - Numeric Violation
August 31, 2025
Coliform, fecal general
1173% over limit
Discharged 2545 MPN/100mL against a permitted limit of 200 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
Coliform, fecal general
8564% over limit
Discharged 86640 MPN/100mL against a permitted limit of 1000 MPN/100mL (INST MAX)
DMR, Limited - Numeric Violation
Chlorine, total residual
8% over limit
Discharged 0.54 mg/L against a permitted limit of 0.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
69% over limit
Discharged 2.7 mg/L against a permitted limit of 1.6 mg/L (INST MAX)
DMR, Limited - Numeric Violation
June 30, 2025
Chlorine, total residual
38% over limit
Discharged 2.2 mg/L against a permitted limit of 1.6 mg/L (INST MAX)
DMR, Limited - Numeric Violation
April 30, 2025
Chlorine, total residual
19% over limit
Discharged 1.9 mg/L against a permitted limit of 1.6 mg/L (INST MAX)
DMR, Limited - Numeric Violation
March 31, 2025
Chlorine, total residual
14% over limit
Discharged 1.82 mg/L against a permitted limit of 1.6 mg/L (INST MAX)
DMR, Limited - Numeric Violation
Coliform, fecal general
384% over limit
Discharged 48392 MPN/100mL against a permitted limit of 10000 MPN/100mL (INST MAX)
DMR, Limited - Numeric Violation
February 28, 2025
Solids, total suspended
55% over limit
Discharged 52.66399956 kg/d against a permitted limit of 34.04999971 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
202% over limit
Discharged 136 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
31% over limit
Discharged 39.3 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Coliform, fecal general
160% over limit
Discharged 25994 MPN/100mL against a permitted limit of 10000 MPN/100mL (INST MAX)
DMR, Limited - Numeric Violation
December 31, 2024
Coliform, fecal general
2% over limit
Discharged 2038 MPN/100mL against a permitted limit of 2000 MPN/100mL (GEO MEAN)
DMR, Limited - Numeric Violation
Coliform, fecal general
160% over limit
Discharged 25994 MPN/100mL against a permitted limit of 10000 MPN/100mL (INST MAX)
DMR, Limited - Numeric Violation
September 30, 2024
Nitrogen, Total
0% over limit
Discharged 1416.0259881 kg against a permitted limit of 0 kg (ANNL TOT)
DMR, Monitor Only - Overdue
Nitrogen, Ammonia Total
0% over limit
Discharged 680.09199429 kg against a permitted limit of 0 kg (ANNL TOT)
DMR, Monitor Only - Overdue
Phosphorus, Total
0% over limit
Discharged 304.17999744 kg against a permitted limit of 0 kg (ANNL TOT)
DMR, Monitor Only - Overdue
Coliform, fecal general
2320% over limit
Discharged 24196 MPN/100mL against a permitted limit of 1000 MPN/100mL (INST MAX)
DMR, Limited - Numeric Violation
August 31, 2024
Coliform, fecal general
868% over limit
Discharged 9678.4 MPN/100mL against a permitted limit of 1000 MPN/100mL (INST MAX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (24 days ago)