PRESTON, CITY OF - PRESTON WWTP
NPDES ID: ID0020214
S — SNC: Compliance schedule violation
The facility missed a deadline in its compliance schedule by more than 90 days.
Violations
December 31, 2025
Nitrogen, ammonia total [as N]
122% over limit
Discharged 20.65245983 kg/d against a permitted limit of 9.307 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
82% over limit
Discharged 33.96373971 kg/d against a permitted limit of 18.6594 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
376% over limit
Discharged 19.5 mg/L against a permitted limit of 4.1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
432% over limit
Discharged 10.63 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2025
Nitrogen, ammonia total [as N]
115% over limit
Discharged 8.83 mg/L against a permitted limit of 4.1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
239% over limit
Discharged 6.77 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
43% over limit
Discharged 13.27495989 kg/d against a permitted limit of 9.307 kg/d (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Nitrogen, ammonia total [as N]
29% over limit
Discharged 2.58 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
94% over limit
Discharged 7.95 mg/L against a permitted limit of 4.1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2025
Nitrogen, ammonia total [as N]
71% over limit
Discharged 7.02 mg/L against a permitted limit of 4.1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2025
Nitrogen, ammonia total [as N]
25% over limit
Discharged 23.2402598 kg/d against a permitted limit of 18.6594 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
54% over limit
Discharged 3.07 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
34% over limit
Discharged 5.48 mg/L against a permitted limit of 4.1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
July 31, 2025
Nitrogen, ammonia total [as N]
494% over limit
Discharged 11.87 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
120% over limit
Discharged 41.13239965 kg/d against a permitted limit of 18.6594 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
420% over limit
Discharged 21.3 mg/L against a permitted limit of 4.1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
148% over limit
Discharged 23.12221981 kg/d against a permitted limit of 9.307 kg/d (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrogen, ammonia total [as N]
534% over limit
Discharged 26 mg/L against a permitted limit of 4.1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
201% over limit
Discharged 56.11439953 kg/d against a permitted limit of 18.6594 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1032% over limit
Discharged 22.63 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
429% over limit
Discharged 49.22267959 kg/d against a permitted limit of 9.307 kg/d (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Nitrogen, ammonia total [as N]
880% over limit
Discharged 19.6 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
437% over limit
Discharged 49.97631958 kg/d against a permitted limit of 9.307 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
221% over limit
Discharged 59.9779395 kg/d against a permitted limit of 18.6594 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
461% over limit
Discharged 23 mg/L against a permitted limit of 4.1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2025
Solids, total suspended
3% over limit
Discharged 85.39739928 kg/d against a permitted limit of 82.62799931 kg/d (ANNL AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
390% over limit
Discharged 9.8 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
231% over limit
Discharged 30.76303974 kg/d against a permitted limit of 9.307 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
154% over limit
Discharged 10.4 mg/L against a permitted limit of 4.1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
99% over limit
Discharged 37.07817969 kg/d against a permitted limit of 18.6594 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2025
Nitrogen, ammonia total [as N]
179% over limit
Discharged 25.96879978 kg/d against a permitted limit of 9.307 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
8% over limit
Discharged 89.62413925 kg/d against a permitted limit of 82.62799931 kg/d (ANNL AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
144% over limit
Discharged 10.02 mg/L against a permitted limit of 4.1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
64% over limit
Discharged 30.50879974 kg/d against a permitted limit of 18.6594 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
310% over limit
Discharged 8.2 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Nitrogen, ammonia total [as N]
179% over limit
Discharged 25.98241978 kg/d against a permitted limit of 9.307 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
445% over limit
Discharged 10.9 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
195% over limit
Discharged 12.1 mg/L against a permitted limit of 4.1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
47% over limit
Discharged 27.48969977 kg/d against a permitted limit of 18.6594 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2025
Nitrogen, ammonia total [as N]
56% over limit
Discharged 29.07869976 kg/d against a permitted limit of 18.6594 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
193% over limit
Discharged 12 mg/L against a permitted limit of 4.1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
452% over limit
Discharged 11.04 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
5% over limit
Discharged 31.4 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
186% over limit
Discharged 26.58623978 kg/d against a permitted limit of 9.307 kg/d (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2024
Nitrogen, ammonia total [as N]
66% over limit
Discharged 30.99003974 kg/d against a permitted limit of 18.6594 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
490% over limit
Discharged 11.8 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
18% over limit
Discharged 35.25 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
210% over limit
Discharged 28.89709976 kg/d against a permitted limit of 9.307 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
222% over limit
Discharged 13.2 mg/L against a permitted limit of 4.1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2024
Nitrogen, ammonia total [as N]
70% over limit
Discharged 31.71189973 kg/d against a permitted limit of 18.6594 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
195% over limit
Discharged 27.45791977 kg/d against a permitted limit of 9.307 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
450% over limit
Discharged 11 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
205% over limit
Discharged 12.5 mg/L against a permitted limit of 4.1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
October 31, 2024
Nitrogen, ammonia total [as N]
485% over limit
Discharged 11.69 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
194% over limit
Discharged 27.38073977 kg/d against a permitted limit of 9.307 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
244% over limit
Discharged 14.1 mg/L against a permitted limit of 4.1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
4% over limit
Discharged 31.2 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
92% over limit
Discharged 35.7706597 kg/d against a permitted limit of 18.6594 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2024
Nitrogen, ammonia total [as N]
133% over limit
Discharged 9.57 mg/L against a permitted limit of 4.1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
175% over limit
Discharged 25.57381979 kg/d against a permitted limit of 9.307 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
357% over limit
Discharged 9.14 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
70% over limit
Discharged 31.69373973 kg/d against a permitted limit of 18.6594 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
23% over limit
Discharged 36.75 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2024
Nitrogen, ammonia total [as N]
359% over limit
Discharged 18.8 mg/L against a permitted limit of 4.1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
148% over limit
Discharged 46.27167961 kg/d against a permitted limit of 18.6594 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
471% over limit
Discharged 11.41 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
216% over limit
Discharged 29.40103975 kg/d against a permitted limit of 9.307 kg/d (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2024
Nitrogen, ammonia total [as N]
143% over limit
Discharged 22.65005981 kg/d against a permitted limit of 9.307 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
357% over limit
Discharged 9.13 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
176% over limit
Discharged 11.3 mg/L against a permitted limit of 4.1 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
49% over limit
Discharged 27.81203977 kg/d against a permitted limit of 18.6594 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)