ALEXANDRIA STP
NPDES ID: TN0021539
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: 12 effluent violations.
Violations
May 31, 2026
Nitrogen, ammonia total [as N]
4% over limit
Discharged 0.84670999 kg/d against a permitted limit of 0.81719999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
102% over limit
Discharged 2.22 mg/L against a permitted limit of 1.1 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
59% over limit
Discharged 2.22 mg/L against a permitted limit of 1.4 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
5% over limit
Discharged 42 mg/L against a permitted limit of 40 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
23% over limit
Discharged 2.38520202 kg/d against a permitted limit of 1.93688002 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
165% over limit
Discharged 1.853 mg/L against a permitted limit of 0.7 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Phosphorus, total [as P]
58% over limit
Discharged 3.06862803 kg/d against a permitted limit of 1.93688002 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Nitrogen, total [as N]
3% over limit
Discharged 9.54986009 kg/d against a permitted limit of 9.30248009 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Nitrogen, total [as N]
12% over limit
Discharged 10.4098001 kg/d against a permitted limit of 9.30248009 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
33% over limit
Discharged 2.57920003 kg/d against a permitted limit of 1.93688002 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Nitrogen, total [as N]
23% over limit
Discharged 11.40552011 kg/d against a permitted limit of 9.30248009 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
14% over limit
Discharged 2.39 mg/L against a permitted limit of 2.1 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
46% over limit
Discharged 2.83327603 kg/d against a permitted limit of 1.93688002 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Phosphorus, total [as P]
55% over limit
Discharged 3.00073803 kg/d against a permitted limit of 1.93688002 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Nitrogen, total [as N]
27% over limit
Discharged 11.78117812 kg/d against a permitted limit of 9.30248009 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Nitrogen, total [as N]
27% over limit
Discharged 11.85477212 kg/d against a permitted limit of 9.30248009 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
64% over limit
Discharged 3.17725203 kg/d against a permitted limit of 1.93688002 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
November 30, 2025
Nitrogen, ammonia total [as N]
38% over limit
Discharged 3.85 mg/L against a permitted limit of 2.8 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
83% over limit
Discharged 3.85 mg/L against a permitted limit of 2.1 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, total [as N]
36% over limit
Discharged 12.61396213 kg/d against a permitted limit of 9.30248009 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
21% over limit
Discharged 1.69 mg/L against a permitted limit of 1.4 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
80% over limit
Discharged 3.48502003 kg/d against a permitted limit of 1.93688002 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
33% over limit
Discharged 80 % against a permitted limit of 85 % (AVG MN)
DMR, Limited - Numeric Violation
October 31, 2025
Solids, total suspended
85% over limit
Discharged 84.17159929 kg/d against a permitted limit of 45.39999962 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
37% over limit
Discharged 79.4 % against a permitted limit of 85 % (AVG MN)
DMR, Limited - Numeric Violation
Solids, total suspended
43% over limit
Discharged 57 mg/L against a permitted limit of 40 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
67% over limit
Discharged 0 % against a permitted limit of 40 % (DAILY MN)
DMR, Limited - Numeric Violation
Nitrogen, total [as N]
40% over limit
Discharged 13.03488013 kg/d against a permitted limit of 9.30248009 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
96% over limit
Discharged 3.80184004 kg/d against a permitted limit of 1.93688002 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
27% over limit
Discharged 57 mg/L against a permitted limit of 45 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
September 30, 2025
Nitrogen, ammonia total [as N]
334% over limit
Discharged 6.08 mg/L against a permitted limit of 1.4 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
130% over limit
Discharged 1.61 mg/L against a permitted limit of 0.7 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
204% over limit
Discharged 3.85899997 kg/d against a permitted limit of 1.27119999 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
81% over limit
Discharged 3.50436403 kg/d against a permitted limit of 1.93688002 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
33% over limit
Discharged 1.08959999 kg/d against a permitted limit of 0.81719999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
453% over limit
Discharged 6.08 mg/L against a permitted limit of 1.1 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Nitrogen, total [as N]
7% over limit
Discharged 9.9119401 kg/d against a permitted limit of 9.30248009 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
75% over limit
Discharged 3.39450003 kg/d against a permitted limit of 1.93688002 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
33% over limit
Discharged 4 mg/L against a permitted limit of 6 mg/L (INST MIN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
4% over limit
Discharged 0.726 mg/L against a permitted limit of 0.7 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
E. coli
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 126 MPN/100mL (MO GEOMN)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 941 MPN/100mL (DAILY MX)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
8% over limit
Discharged 1.19 mg/L against a permitted limit of 1.1 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
0% over limit
Discharged 0 kg/d against a permitted limit of 1.93688002 kg/d (ROLL AVG)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
24% over limit
Discharged 0.868 mg/L against a permitted limit of 0.7 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, total [as N]
0% over limit
Discharged 0 kg/d against a permitted limit of 9.30248009 kg/d (ROLL AVG)
DMR, Limited - Overdue
June 30, 2025
Solids, suspended percent removal
40% over limit
Discharged 79 % against a permitted limit of 85 % (AVG MN)
DMR, Limited - Numeric Violation
Nitrogen, total [as N]
57% over limit
Discharged 14.57496014 kg/d against a permitted limit of 9.30248009 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
110% over limit
Discharged 2.66497998 kg/d against a permitted limit of 1.27119999 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
202% over limit
Discharged 4.23 mg/L against a permitted limit of 1.4 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
102% over limit
Discharged 2.22 mg/L against a permitted limit of 1.1 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
84% over limit
Discharged 3.57330804 kg/d against a permitted limit of 1.93688002 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
7% over limit
Discharged 48 mg/L against a permitted limit of 45 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
217% over limit
Discharged 2.22 mg/L against a permitted limit of 0.7 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
226% over limit
Discharged 2.66497998 kg/d against a permitted limit of 0.81719999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Nitrogen, total [as N]
62% over limit
Discharged 15.04144815 kg/d against a permitted limit of 9.30248009 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
41% over limit
Discharged 1.97 mg/L against a permitted limit of 1.4 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
8% over limit
Discharged 35.5 % against a permitted limit of 40 % (DAILY MN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
18% over limit
Discharged 1.50273999 kg/d against a permitted limit of 1.27119999 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
3% over limit
Discharged 84.5 % against a permitted limit of 85 % (AVG MN)
DMR, Limited - Numeric Violation
Solids, total suspended
7% over limit
Discharged 48 mg/L against a permitted limit of 45 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
50% over limit
Discharged 1.05 mg/L against a permitted limit of 0.7 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
76% over limit
Discharged 3.41260403 kg/d against a permitted limit of 1.93688002 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
84% over limit
Discharged 1.50273999 kg/d against a permitted limit of 0.81719999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Phosphorus, total [as P]
52% over limit
Discharged 2.93681603 kg/d against a permitted limit of 1.93688002 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Nitrogen, total [as N]
60% over limit
Discharged 14.92290415 kg/d against a permitted limit of 9.30248009 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
March 31, 2025
Nitrogen, total [as N]
75% over limit
Discharged 16.27202416 kg/d against a permitted limit of 9.30248009 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
62% over limit
Discharged 3.13162003 kg/d against a permitted limit of 1.93688002 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
26% over limit
Discharged 1.76 mg/L against a permitted limit of 1.4 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
3% over limit
Discharged 1.63439999 kg/d against a permitted limit of 1.58899999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Nitrogen, total [as N]
87% over limit
Discharged 17.37128417 kg/d against a permitted limit of 9.30248009 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
59% over limit
Discharged 3.07879603 kg/d against a permitted limit of 1.93688002 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Nitrogen, total [as N]
30% over limit
Discharged 12.07239212 kg/d against a permitted limit of 9.30248009 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
4% over limit
Discharged 2.01475202 kg/d against a permitted limit of 1.93688002 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
December 31, 2024
Phosphorus, total [as P]
21% over limit
Discharged 2.33826802 kg/d against a permitted limit of 1.93688002 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
November 30, 2024
Phosphorus, total [as P]
21% over limit
Discharged 2.33826802 kg/d against a permitted limit of 1.93688002 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
October 31, 2024
BOD, carbonaceous [5 day, 20 C]
133% over limit
Discharged 35 mg/L against a permitted limit of 15 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
18% over limit
Discharged 1.3 mg/L against a permitted limit of 1.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
59% over limit
Discharged 27.01299977 kg/d against a permitted limit of 17.02499986 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
36% over limit
Discharged 3 mg/L against a permitted limit of 2.2 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
625% over limit
Discharged 145 mg/L against a permitted limit of 20 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
138% over limit
Discharged 27.01299977 kg/d against a permitted limit of 11.3499999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
250% over limit
Discharged 35 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Nitrogen, ammonia total [as N]
7% over limit
Discharged 2.35 mg/L against a permitted limit of 2.2 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
10% over limit
Discharged 1.39831999 kg/d against a permitted limit of 1.27119999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
3% over limit
Discharged 1.75 mg/L against a permitted limit of 1.7 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
59% over limit
Discharged 1.75 mg/L against a permitted limit of 1.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2024
Phosphorus, total [as P]
25% over limit
Discharged 2.41576802 kg/d against a permitted limit of 1.93688002 kg/d (ROLL AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
17% over limit
Discharged 1.29 mg/L against a permitted limit of 1.1 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (4 days ago)