LA PLATA WWTP
NPDES ID: MD0020524
X — SNC: Effluent violation (non-monthly average limit)
The facility discharged more of a pollutant than its permit allows, measured over a period other than a monthly average.
This quarter: 2 effluent violations.
Violations
April 30, 2026
Nitrogen, ammonia total [as N]
35% over limit
Discharged 12.2579999 kg/d against a permitted limit of 9.07999992 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
100% over limit
Discharged 3.2 mg/L against a permitted limit of 1.6 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
March 31, 2026
Nitrogen, ammonia total [as N]
81% over limit
Discharged 2.9 mg/L against a permitted limit of 1.6 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
45% over limit
Discharged 13.16599989 kg/d against a permitted limit of 9.07999992 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
February 28, 2026
Coliform, fecal general
1093% over limit
Discharged 167 MPN/100mL against a permitted limit of 14 MPN/100mL (MEDIAN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
169% over limit
Discharged 4.3 mg/L against a permitted limit of 1.6 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
160% over limit
Discharged 23.6079998 kg/d against a permitted limit of 9.07999992 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
January 31, 2026
Nitrogen, ammonia total [as N]
75% over limit
Discharged 2.8 mg/L against a permitted limit of 1.6 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
25% over limit
Discharged 11.3499999 kg/d against a permitted limit of 9.07999992 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
December 31, 2025
Nitrogen, total [as N]
1% over limit
Discharged 22.86436023 kg/d against a permitted limit of 22.65852023 kg/d (CUM TOTL)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrogen, ammonia total [as N]
48% over limit
Discharged 5.90199995 kg/d against a permitted limit of 3.99519997 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
100% over limit
Discharged 1.4 mg/L against a permitted limit of 0.7 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
166% over limit
Discharged 8.5 mg/L against a permitted limit of 3.2 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
59% over limit
Discharged 1.60919998 kg/d against a permitted limit of 1.01319999 kg/d (MO TOTAL)
DMR, Limited - Numeric Violation
Nitrogen, total [as N]
19% over limit
Discharged 24.01879973 kg/d against a permitted limit of 20.18949978 kg/d (MO TOTAL)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
88% over limit
Discharged 34.04999971 kg/d against a permitted limit of 18.15999985 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
May 31, 2025
Nitrogen, ammonia total [as N]
25% over limit
Discharged 4.99399996 kg/d against a permitted limit of 3.99519997 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
29% over limit
Discharged 0.9 mg/L against a permitted limit of 0.7 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, total [as N]
25% over limit
Discharged 25.16609972 kg/d against a permitted limit of 20.18949978 kg/d (MO TOTAL)
DMR, Limited - Numeric Violation
Copper, total recoverable
6% over limit
Discharged 0.007 mg/L against a permitted limit of 0.0066 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2025
Polychlorinated biphenyls [PCBs]
0% over limit
Discharged 3.2e-7 kg/d against a permitted limit of 0 kg/d (ANNL MAX)
DMR, Monitor Only - Overdue
BOD, 5-day, percent removal
17% over limit
Discharged 82.5 % against a permitted limit of 85 % (MINIMUM)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
244% over limit
Discharged 5.5 mg/L against a permitted limit of 1.6 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
18% over limit
Discharged 11.9 mg/L against a permitted limit of 10.1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
195% over limit
Discharged 26.78599977 kg/d against a permitted limit of 9.07999992 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
March 31, 2025
Benzo[k]fluoranthene
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (QRTR AVG)
DMR, Monitor Only - Overdue
Benzo[a]anthracene
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (QRTR AVG)
DMR, Monitor Only - Overdue
Dibenzo[a,h]anthracene, dry weight
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (QRTR AVG)
DMR, Monitor Only - Overdue
Arsenic, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (QRTR AVG)
DMR, Monitor Only - Overdue
Thallium, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (QRTR AVG)
DMR, Monitor Only - Overdue
Polychlorinated biphenyls [PCBs]
0% over limit
Discharged 2e-7 mg/L against a permitted limit of 0 mg/L (ANNL AVG)
DMR, Monitor Only - Overdue
Benzidine
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (QRTR AVG)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
69% over limit
Discharged 26.78599977 kg/d against a permitted limit of 15.88999987 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
Indeno[1,2,3-cd]pyrene
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (QRTR AVG)
DMR, Monitor Only - Overdue
Chlordane
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (QRTR AVG)
DMR, Monitor Only - Overdue
Polychlorinated biphenyls [PCBs]
0% over limit
Discharged 2.4e-7 kg/d against a permitted limit of 0 kg/d (ANNL MAX)
DMR, Monitor Only - Overdue
Heptachlor + Heptachlor Epoxide
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (QRTR AVG)
DMR, Monitor Only - Overdue
Toxaphene
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (QRTR AVG)
DMR, Monitor Only - Overdue
Heptachlor
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (QRTR AVG)
DMR, Monitor Only - Overdue
Acrolein
0% over limit
Discharged 2.5 mg/L against a permitted limit of 0 mg/L (QRTR AVG)
DMR, Monitor Only - Overdue
4,4'-DDT
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (QRTR AVG)
DMR, Monitor Only - Overdue
Benzo[a]pyrene
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (QRTR AVG)
DMR, Monitor Only - Overdue
Chrysene
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (QRTR AVG)
DMR, Monitor Only - Overdue
Cadmium, total recoverable
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (QRTR AVG)
DMR, Monitor Only - Overdue
3,4-Benzofluoranthene
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (QRTR AVG)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
86% over limit
Discharged 5.2 mg/L against a permitted limit of 2.8 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
February 28, 2025
Nitrogen, ammonia total [as N]
57% over limit
Discharged 4.4 mg/L against a permitted limit of 2.8 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Coliform, fecal general
250% over limit
Discharged 49 MPN/100mL against a permitted limit of 14 MPN/100mL (MEDIAN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
43% over limit
Discharged 22.69999981 kg/d against a permitted limit of 15.88999987 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
January 31, 2025
Coliform, fecal general
793% over limit
Discharged 125 MPN/100mL against a permitted limit of 14 MPN/100mL (MEDIAN)
DMR, Limited - Numeric Violation
Copper, total recoverable
198% over limit
Discharged 0.014 mg/L against a permitted limit of 0.0047 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
794% over limit
Discharged 0.059 mg/L against a permitted limit of 0.0066 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2024
Coliform, fecal general
1364% over limit
Discharged 205 MPN/100mL against a permitted limit of 14 MPN/100mL (MEDIAN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
50% over limit
Discharged 4.2 mg/L against a permitted limit of 2.8 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
9% over limit
Discharged 17.25199986 kg/d against a permitted limit of 15.88999987 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
September 30, 2024
Coliform, fecal general
121% over limit
Discharged 31 MPN/100mL against a permitted limit of 14 MPN/100mL (MEDIAN)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (5 days ago)