NEW HAMPTON CITY OF STP
NPDES ID: IA0028525
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: 2 effluent violations.
Violations
May 31, 2026
Copper, total [as Cu]
0% over limit
Discharged 0.017171 mg/L against a permitted limit of 0.0171 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Aluminum, total [as Al]
18% over limit
Discharged 0.102975 mg/L against a permitted limit of 0.0873 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Aluminum, total [as Al]
57% over limit
Discharged 0.137075 mg/L against a permitted limit of 0.0873 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Aluminum, total [as Al]
96% over limit
Discharged 0.1712 mg/L against a permitted limit of 0.0873 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
6% over limit
Discharged 0.018113 mg/L against a permitted limit of 0.0171 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
November 30, 2025
Copper, total [as Cu]
2% over limit
Discharged 0.017391 mg/L against a permitted limit of 0.0171 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
93% over limit
Discharged 0.168625 mg/L against a permitted limit of 0.0873 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
12% over limit
Discharged 0.03 mg/L against a permitted limit of 0.0269 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
October 31, 2025
Aluminum, total [as Al]
65% over limit
Discharged 0.14398 mg/L against a permitted limit of 0.0873 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Aluminum, total [as Al]
55% over limit
Discharged 0.13535 mg/L against a permitted limit of 0.0873 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Copper, total [as Cu]
30% over limit
Discharged 0.29103397 kg/d against a permitted limit of 0.2242306 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
87% over limit
Discharged 1.869411 mg/L against a permitted limit of 1 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
8% over limit
Discharged 0.78588761 kg/d against a permitted limit of 0.72712639 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
32% over limit
Discharged 0.1148 mg/L against a permitted limit of 0.0873 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
44% over limit
Discharged 32.26395011 kg/d against a permitted limit of 22.47299981 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
61% over limit
Discharged 13.13012027 kg/d against a permitted limit of 8.17199993 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Nitrogen, ammonia total [as N]
356% over limit
Discharged 15.96 mg/L against a permitted limit of 3.5 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
399% over limit
Discharged 5.491111 mg/L against a permitted limit of 1.1 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
43% over limit
Discharged 0.0386 mg/L against a permitted limit of 0.0269 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
184% over limit
Discharged 0.24758 mg/L against a permitted limit of 0.0873 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
1% over limit
Discharged 0.017258 mg/L against a permitted limit of 0.0171 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
277% over limit
Discharged 87.86566106 kg/d against a permitted limit of 23.3355998 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
2% over limit
Discharged 4.88 mg/L against a permitted limit of 5 mg/L (DAILY MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
271% over limit
Discharged 31.97783477 kg/d against a permitted limit of 8.62599993 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
177% over limit
Discharged 2.01524197 kg/d against a permitted limit of 0.72712639 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
25% over limit
Discharged 0.28134516 kg/d against a permitted limit of 0.2242306 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrogen, ammonia total [as N]
169% over limit
Discharged 82.9326333 kg/d against a permitted limit of 30.82659974 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
10% over limit
Discharged 0.8014303 kg/d against a permitted limit of 0.72712639 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
224% over limit
Discharged 36.29744044 kg/d against a permitted limit of 11.21379991 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
56% over limit
Discharged 0.13645 mg/L against a permitted limit of 0.0873 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
127% over limit
Discharged 10.43 mg/L against a permitted limit of 4.6 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
315% over limit
Discharged 5.813705 mg/L against a permitted limit of 1.4 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Nitrogen, ammonia total [as N]
18% over limit
Discharged 7.56 mg/L against a permitted limit of 6.4 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
24% over limit
Discharged 2.224444 mg/L against a permitted limit of 1.8 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
70% over limit
Discharged 0.1486 mg/L against a permitted limit of 0.0873 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Nitrogen, ammonia total [as N]
42% over limit
Discharged 13.09 mg/L against a permitted limit of 9.2 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
45% over limit
Discharged 18.90021052 kg/d against a permitted limit of 13.07519989 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
113% over limit
Discharged 3.410555 mg/L against a permitted limit of 1.6 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
4% over limit
Discharged 65.77066165 kg/d against a permitted limit of 63.28759947 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2025
Aluminum, total [as Al]
42% over limit
Discharged 0.12375 mg/L against a permitted limit of 0.0873 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
February 28, 2025
BOD, carbonaceous [5 day, 20 C]
12% over limit
Discharged 27.95937 mg/L against a permitted limit of 25 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
79% over limit
Discharged 0.0481 mg/L against a permitted limit of 0.0269 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
52% over limit
Discharged 0.026 mg/L against a permitted limit of 0.0171 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Aluminum, total [as Al]
50% over limit
Discharged 0.130525 mg/L against a permitted limit of 0.0873 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Copper, total [as Cu]
100% over limit
Discharged 0.0538 mg/L against a permitted limit of 0.0269 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Copper, total [as Cu]
27% over limit
Discharged 0.021764 mg/L against a permitted limit of 0.0171 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
19% over limit
Discharged 4.271666 mg/L against a permitted limit of 3.6 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
December 31, 2024
Nitrogen, ammonia total [as N]
337% over limit
Discharged 35.68568452 kg/d against a permitted limit of 8.17199993 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2024
Copper, total [as Cu]
2% over limit
Discharged 0.0275 mg/L against a permitted limit of 0.0269 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (4 days ago)