DESOTO CO REGIONAL UTILITY AUTHORITY, METRO DESOTO WWTP
NPDES ID: MS0028479
S — SNC: Compliance schedule violation
The facility missed a deadline in its compliance schedule by more than 90 days.
This quarter: 7 effluent violations.
Violations
June 30, 2026
%Effect Static Renewal 7Day Chronic Pimephales promelas
41% over limit
Discharged 59.5 % against a permitted limit of 100 % (MINIMUM)
DMR, Limited - Numeric Violation
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia
47% over limit
Discharged 52.74 % against a permitted limit of 100 % (MINIMUM)
DMR, Limited - Numeric Violation
May 31, 2026
Cadmium, total recoverable
139% over limit
Discharged 0.0011 mg/L against a permitted limit of 0.00046 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2026
pH
0% over limit
Discharged 5.5 SU against a permitted limit of 6 SU (MINIMUM)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
23% over limit
Discharged 1.69 mg/L against a permitted limit of 1.37 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
45% over limit
Discharged 2.98 mg/L against a permitted limit of 2.05 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
93% over limit
Discharged 0.00089 mg/L against a permitted limit of 0.00046 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2026
%Effect Static Renewal 7Day Chronic Pimephales promelas
85% over limit
Discharged 14.9 % against a permitted limit of 100 % (MINIMUM)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
52% over limit
Discharged 0.0007 mg/L against a permitted limit of 0.00046 mg/L (MO AVG)
DMR, Limited - Numeric Violation
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia
99% over limit
Discharged 1.363 % against a permitted limit of 100 % (MINIMUM)
DMR, Limited - Numeric Violation
February 28, 2026
BOD, 5-day, 20 deg. C
83% over limit
Discharged 44 mg/L against a permitted limit of 24 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
24% over limit
Discharged 1.7 mg/L against a permitted limit of 1.37 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
170% over limit
Discharged 0.0131 mg/L against a permitted limit of 0.00485 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
13% over limit
Discharged 2.31 mg/L against a permitted limit of 2.05 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
2748% over limit
Discharged 0.0131 mg/L against a permitted limit of 0.00046 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Nitrogen, ammonia total [as N]
294% over limit
Discharged 8.07 mg/L against a permitted limit of 2.05 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
11% over limit
Discharged 8.62599993 kg/d against a permitted limit of 7.78155993 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Copper, total recoverable
63% over limit
Discharged 0.0317 mg/L against a permitted limit of 0.0194 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
335% over limit
Discharged 0.002 mg/L against a permitted limit of 0.00046 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
1% over limit
Discharged 0.0317 mg/L against a permitted limit of 0.0315 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
112% over limit
Discharged 2.9 mg/L against a permitted limit of 1.37 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
21% over limit
Discharged 29 mg/L against a permitted limit of 24 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
December 31, 2025
Nitrogen, ammonia total [as N]
130% over limit
Discharged 3.15 mg/L against a permitted limit of 1.37 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
153% over limit
Discharged 5.18 mg/L against a permitted limit of 2.05 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
639% over limit
Discharged 0.0034 mg/L against a permitted limit of 0.00046 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
38% over limit
Discharged 33 mg/L against a permitted limit of 24 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia
96% over limit
Discharged 4.001 % against a permitted limit of 100 % (MINIMUM)
DMR, Limited - Numeric Violation
November 30, 2025
Cadmium, total recoverable
215% over limit
Discharged 0.00145 mg/L against a permitted limit of 0.00046 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
90% over limit
Discharged 2.6 mg/L against a permitted limit of 1.37 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
6% over limit
Discharged 17 mg/L against a permitted limit of 16 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
46% over limit
Discharged 35 mg/L against a permitted limit of 24 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
173% over limit
Discharged 5.59 mg/L against a permitted limit of 2.05 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
October 31, 2025
Nitrogen, ammonia total [as N]
515% over limit
Discharged 12.6 mg/L against a permitted limit of 2.05 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
323% over limit
Discharged 5.8 mg/L against a permitted limit of 1.37 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
51% over limit
Discharged 7.85419993 kg/d against a permitted limit of 5.18921996 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
1204% over limit
Discharged 0.006 mg/L against a permitted limit of 0.00046 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
24% over limit
Discharged 0.006 mg/L against a permitted limit of 0.00485 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
46% over limit
Discharged 11.3499999 kg/d against a permitted limit of 7.78155993 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
September 30, 2025
BOD, 5-day, 20 deg. C
33% over limit
Discharged 32 mg/L against a permitted limit of 24 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
661% over limit
Discharged 0.0035 mg/L against a permitted limit of 0.00046 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
73% over limit
Discharged 8.98919992 kg/d against a permitted limit of 5.18921996 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
209% over limit
Discharged 24.0619998 kg/d against a permitted limit of 7.78155993 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia
88% over limit
Discharged 11.7 % against a permitted limit of 100 % (MINIMUM)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
690% over limit
Discharged 16.2 mg/L against a permitted limit of 2.05 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
367% over limit
Discharged 6.4 mg/L against a permitted limit of 1.37 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Copper, total recoverable
12% over limit
Discharged 0.0217 mg/L against a permitted limit of 0.0194 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
400% over limit
Discharged 0.0023 mg/L against a permitted limit of 0.00046 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Cadmium, total recoverable
443% over limit
Discharged 0.0025 mg/L against a permitted limit of 0.00046 mg/L (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia
77% over limit
Discharged 23.32 % against a permitted limit of 100 % (MINIMUM)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
400% over limit
Discharged 0.0023 mg/L against a permitted limit of 0.00046 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Chlorine, total residual
42% over limit
Discharged 0.027 mg/L against a permitted limit of 0.019 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
552% over limit
Discharged 0.003 mg/L against a permitted limit of 0.00046 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
45% over limit
Discharged 0.016 mg/L against a permitted limit of 0.011 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Oxygen, dissolved [DO]
47% over limit
Discharged 3.2 mg/L against a permitted limit of 6 mg/L (MINIMUM)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
987% over limit
Discharged 0.005 mg/L against a permitted limit of 0.00046 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
32% over limit
Discharged 0.0064 mg/L against a permitted limit of 0.00485 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Copper, total recoverable
49% over limit
Discharged 0.029 mg/L against a permitted limit of 0.0194 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
8% over limit
Discharged 0.034 mg/L against a permitted limit of 0.0315 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
March 31, 2025
Oxygen, dissolved [DO]
7% over limit
Discharged 5.6 mg/L against a permitted limit of 6 mg/L (MINIMUM)
DMR, Limited - Numeric Violation
Copper, total recoverable
177% over limit
Discharged 0.0872 mg/L against a permitted limit of 0.0315 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Copper, total recoverable
278% over limit
Discharged 0.0733 mg/L against a permitted limit of 0.0194 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
7% over limit
Discharged 84 % against a permitted limit of 85 % (MINIMUM)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
149% over limit
Discharged 0.0121 mg/L against a permitted limit of 0.00485 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
2487% over limit
Discharged 0.0119 mg/L against a permitted limit of 0.00046 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Cadmium, total recoverable
804% over limit
Discharged 0.00416 mg/L against a permitted limit of 0.00046 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
431% over limit
Discharged 0.103 mg/L against a permitted limit of 0.0194 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
227% over limit
Discharged 0.103 mg/L against a permitted limit of 0.0315 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
January 31, 2025
BOD, 5-day, 20 deg. C
171% over limit
Discharged 65 mg/L against a permitted limit of 24 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
65% over limit
Discharged 149.36599874 kg/d against a permitted limit of 90.79999924 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
5% over limit
Discharged 2.16 mg/L against a permitted limit of 2.05 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Copper, total recoverable
415% over limit
Discharged 0.1 mg/L against a permitted limit of 0.0194 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
5% over limit
Discharged 0.02 mg/L against a permitted limit of 0.019 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
24% over limit
Discharged 0.006 mg/L against a permitted limit of 0.00485 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
878% over limit
Discharged 0.0045 mg/L against a permitted limit of 0.00046 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
294% over limit
Discharged 0.124 mg/L against a permitted limit of 0.0315 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
December 31, 2024
Nitrogen, ammonia total [as N]
8% over limit
Discharged 1.48 mg/L against a permitted limit of 1.37 mg/L (MO AVG)
DMR, Limited - Numeric Violation
%Effect Static Renewal 7 Day Chronic Ceriodaphnia dubia
41% over limit
Discharged 59.12 % against a permitted limit of 100 % (MINIMUM)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
33% over limit
Discharged 80 % against a permitted limit of 85 % (MINIMUM)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
111% over limit
Discharged 4.32 mg/L against a permitted limit of 2.05 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Copper, total recoverable
212% over limit
Discharged 0.0984 mg/L against a permitted limit of 0.0315 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
156% over limit
Discharged 0.0124 mg/L against a permitted limit of 0.00485 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
2596% over limit
Discharged 0.0124 mg/L against a permitted limit of 0.00046 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
27% over limit
Discharged 9.89719992 kg/d against a permitted limit of 7.78155993 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Oxygen, dissolved [DO]
70% over limit
Discharged 1.8 mg/L against a permitted limit of 6 mg/L (MINIMUM)
DMR, Limited - Numeric Violation
Copper, total recoverable
407% over limit
Discharged 0.0984 mg/L against a permitted limit of 0.0194 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2024
Copper, total recoverable
201% over limit
Discharged 0.0949 mg/L against a permitted limit of 0.0315 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
1748% over limit
Discharged 0.0085 mg/L against a permitted limit of 0.00046 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
160% over limit
Discharged 0.0126 mg/L against a permitted limit of 0.00485 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Oil & Grease
0% over limit
Discharged 0 mg/L against a permitted limit of 15 mg/L (MX WK AV)
DMR, Limited - Overdue
Copper, total recoverable
310% over limit
Discharged 0.0795 mg/L against a permitted limit of 0.0194 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Oil & Grease
0% over limit
Discharged 0 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Overdue
October 31, 2024
Cadmium, total recoverable
147% over limit
Discharged 0.012 mg/L against a permitted limit of 0.00485 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Copper, total recoverable
379% over limit
Discharged 0.093 mg/L against a permitted limit of 0.0194 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
354% over limit
Discharged 0.143 mg/L against a permitted limit of 0.0315 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
1965% over limit
Discharged 0.0095 mg/L against a permitted limit of 0.00046 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
40% over limit
Discharged 17.11579986 kg/d against a permitted limit of 12.2579999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Solids, total suspended
9% over limit
Discharged 49 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Copper, total recoverable
402% over limit
Discharged 0.158 mg/L against a permitted limit of 0.0315 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 10.5 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Numeric Violation
Flow, in conduit or thru treatment plant
4% over limit
Discharged 0.559 MGD against a permitted limit of 0.537 MGD (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
3% over limit
Discharged 94.8859992 kg/d against a permitted limit of 91.70799923 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
1259% over limit
Discharged 0.00625 mg/L against a permitted limit of 0.00046 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
326% over limit
Discharged 0.0827 mg/L against a permitted limit of 0.0194 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
104% over limit
Discharged 0.0099 mg/L against a permitted limit of 0.00485 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
August 31, 2024
BOD, 5-day, 20 deg. C
23% over limit
Discharged 18.5 mg/L against a permitted limit of 15 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Copper, total recoverable
142% over limit
Discharged 0.047 mg/L against a permitted limit of 0.0194 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
1139% over limit
Discharged 0.0057 mg/L against a permitted limit of 0.00046 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
92% over limit
Discharged 0.0093 mg/L against a permitted limit of 0.00485 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
24% over limit
Discharged 37.68199968 kg/d against a permitted limit of 30.41799974 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Copper, total recoverable
133% over limit
Discharged 0.0735 mg/L against a permitted limit of 0.0315 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
July 31, 2024
Copper, total recoverable
210% over limit
Discharged 0.0975 mg/L against a permitted limit of 0.0315 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Mercury, total recoverable
35% over limit
Discharged 0.0000162 mg/L against a permitted limit of 0.000012 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Copper, total recoverable
396% over limit
Discharged 0.0962 mg/L against a permitted limit of 0.0194 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Flow, in conduit or thru treatment plant
6% over limit
Discharged 0.57 MGD against a permitted limit of 0.537 MGD (MX WK AV)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
246% over limit
Discharged 0.0168 mg/L against a permitted limit of 0.00485 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Cadmium, total recoverable
3324% over limit
Discharged 0.01575 mg/L against a permitted limit of 0.00046 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (24 days ago)