HATTIESBURG SOUTH LAGOON
NPDES ID: MS0020303
S — SNC: Compliance schedule violation
The facility missed a deadline in its compliance schedule by more than 90 days.
This quarter: 2 effluent violations, 1 compliance schedule violation, 1 single-event violation.
Violations
April 30, 2026
Nitrogen, ammonia total [as N]
33% over limit
Discharged 4 mg/L against a permitted limit of 3 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
40% over limit
Discharged 2.8 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Solids, suspended percent removal
60% over limit
Discharged 44 % against a permitted limit of 65 % (MINIMUM)
DMR, Limited - Numeric Violation
January 31, 2026
Solids, suspended percent removal
51% over limit
Discharged 47.3 % against a permitted limit of 65 % (MINIMUM)
DMR, Limited - Numeric Violation
December 31, 2025
E. coli
26% over limit
Discharged 517 MPN/100mL against a permitted limit of 410 MPN/100mL (MX WK AV)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
4% over limit
Discharged 63.5 % against a permitted limit of 65 % (MINIMUM)
DMR, Limited - Numeric Violation
November 30, 2025
Solids, suspended percent removal
44% over limit
Discharged 49.7 % against a permitted limit of 65 % (MINIMUM)
DMR, Limited - Numeric Violation
October 31, 2025
Solids, suspended percent removal
15% over limit
Discharged 59.8 % against a permitted limit of 65 % (MINIMUM)
DMR, Limited - Numeric Violation
E. coli
490% over limit
Discharged 2420 MPN/100mL against a permitted limit of 410 MPN/100mL (MX WK AV)
DMR, Limited - Numeric Violation
August 31, 2025
Solids, suspended percent removal
12% over limit
Discharged 60.8 % against a permitted limit of 65 % (MINIMUM)
DMR, Limited - Numeric Violation
July 31, 2025
Solids, suspended percent removal
6% over limit
Discharged 63 % against a permitted limit of 65 % (MINIMUM)
DMR, Limited - Numeric Violation
June 30, 2025
E. coli
139% over limit
Discharged 980 MPN/100mL against a permitted limit of 410 MPN/100mL (MX WK AV)
DMR, Limited - Numeric Violation
April 30, 2025
Solids, suspended percent removal
19% over limit
Discharged 58.5 % against a permitted limit of 65 % (MINIMUM)
DMR, Limited - Numeric Violation
E. coli
6% over limit
Discharged 435 MPN/100mL against a permitted limit of 410 MPN/100mL (MX WK AV)
DMR, Limited - Numeric Violation
March 31, 2025
Nitrogen, ammonia total [as N]
37% over limit
Discharged 311.44399738 kg/d against a permitted limit of 227.45399809 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
193% over limit
Discharged 8.8 mg/L against a permitted limit of 3 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
88% over limit
Discharged 285.5659976 kg/d against a permitted limit of 151.63599873 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
61% over limit
Discharged 43.5 % against a permitted limit of 65 % (MINIMUM)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
295% over limit
Discharged 7.9 mg/L against a permitted limit of 2 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Solids, suspended percent removal
61% over limit
Discharged 43.7 % against a permitted limit of 65 % (MINIMUM)
DMR, Limited - Numeric Violation
December 31, 2024
Solids, suspended percent removal
97% over limit
Discharged 31.1 % against a permitted limit of 65 % (MINIMUM)
DMR, Limited - Numeric Violation
November 30, 2024
Solids, suspended percent removal
153% over limit
Discharged 11.3 % against a permitted limit of 65 % (MINIMUM)
DMR, Limited - Numeric Violation
BOD, 5-day, percent removal
1% over limit
Discharged 64.7 % against a permitted limit of 65 % (MINIMUM)
DMR, Limited - Numeric Violation
October 31, 2024
BOD, 5-day, 20 deg. C
50% over limit
Discharged 45 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, suspended percent removal
99% over limit
Discharged 30.4 % against a permitted limit of 65 % (MINIMUM)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
4% over limit
Discharged 47 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
September 30, 2024
Solids, suspended percent removal
122% over limit
Discharged 22.2 % against a permitted limit of 65 % (MINIMUM)
DMR, Limited - Numeric Violation
August 31, 2024
Solids, suspended percent removal
60% over limit
Discharged 43.9 % against a permitted limit of 65 % (MINIMUM)
DMR, Limited - Numeric Violation
July 31, 2024
Solids, suspended percent removal
6% over limit
Discharged 62.8 % against a permitted limit of 65 % (MINIMUM)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)