LACONIA MUNICIPAL WWTP
NPDES ID: IN0061239
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: 6 effluent violations, 1 reporting violation.
Violations
May 31, 2026
Nitrogen, ammonia total [as N]
78% over limit
Discharged 0.251062 kg/d against a permitted limit of 0.14074 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
18% over limit
Discharged 0.251062 kg/d against a permitted limit of 0.21338 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
878% over limit
Discharged 54.78 mg/L against a permitted limit of 5.6 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
877% over limit
Discharged 36.15 mg/L against a permitted limit of 3.7 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Nitrogen, ammonia total [as N]
378% over limit
Discharged 41.57 mg/L against a permitted limit of 8.7 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
241% over limit
Discharged 44.67 mg/L against a permitted limit of 13.1 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
March 31, 2026
Coliform, fecal general
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 2000 MPN/100mL (MO GEO)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
126% over limit
Discharged 19.68 mg/L against a permitted limit of 8.7 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
175% over limit
Discharged 35.96 mg/L against a permitted limit of 13.1 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
February 28, 2026
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0 MGD against a permitted limit of 0 MGD (MO AVG)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0 kg/d against a permitted limit of 0.33142 kg/d (MO AVG)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 8.7 mg/L (MO AVG)
DMR, Limited - Overdue
Coliform, fecal general
0% over limit
Discharged 0 MPN/100mL against a permitted limit of 2000 MPN/100mL (MO GEO)
DMR, Limited - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0 mg/L against a permitted limit of 13.1 mg/L (MX WK AV)
DMR, Limited - Overdue
Flow, total
0% over limit
Discharged 0 MGD against a permitted limit of 0 MGD (MO TOTAL)
DMR, Monitor Only - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 0 kg/d against a permitted limit of 0.95339999 kg/d (MO AVG)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0 kg/d against a permitted limit of 0.4994 kg/d (MX WK AV)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 0 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 0 kg/d against a permitted limit of 1.52543999 kg/d (MX WK AV)
DMR, Limited - Overdue
pH
0% over limit
Discharged 0 SU against a permitted limit of 6 SU (DAILY MN)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0 kg/d against a permitted limit of 1.72065999 kg/d (MX WK AV)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 0 mg/L against a permitted limit of 40 mg/L (MX WK AV)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0 kg/d against a permitted limit of 1.14407999 kg/d (MO AVG)
DMR, Limited - Overdue
August 31, 2025
Nitrogen, ammonia total [as N]
11% over limit
Discharged 4.1 mg/L against a permitted limit of 3.7 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Nitrogen, ammonia total [as N]
16% over limit
Discharged 4.3 mg/L against a permitted limit of 3.7 mg/L (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
E. coli, colony forming units [CFU]
0% over limit
Discharged 51 MPN/100mL against a permitted limit of 125 MPN/100mL (MO GEO)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 4.6 mg/L against a permitted limit of 5.6 mg/L (MX WK AV)
DMR, Limited - Overdue
Flow, total
0% over limit
Discharged 0.0009212 MGD against a permitted limit of 0 MGD (MO TOTAL)
DMR, Monitor Only - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 6 mg/L against a permitted limit of 40 mg/L (MX WK AV)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.001 MGD against a permitted limit of 0 MGD (MO AVG)
DMR, Monitor Only - Overdue
E. coli, colony forming units [CFU]
0% over limit
Discharged 58 MPN/100mL against a permitted limit of 235 MPN/100mL (DAILY MX)
DMR, Limited - Overdue
pH
0% over limit
Discharged 7.4 SU against a permitted limit of 6 SU (DAILY MN)
DMR, Limited - Overdue
pH
0% over limit
Discharged 7.7 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
16% over limit
Discharged 4.3 mg/L against a permitted limit of 3.7 mg/L (MO AVG)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
16% over limit
Discharged 4.3 mg/L against a permitted limit of 3.7 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 4.1 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0.00908 kg/d against a permitted limit of 1.14407999 kg/d (MO AVG)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.01362 kg/d against a permitted limit of 0.21338 kg/d (MX WK AV)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 0.011804 kg/d against a permitted limit of 0.95339999 kg/d (MO AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 3.1 mg/L against a permitted limit of 30 mg/L (MO AVG)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.01362 kg/d against a permitted limit of 0.14074 kg/d (MO AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0.00908 kg/d against a permitted limit of 1.72065999 kg/d (MX WK AV)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 0.01816 kg/d against a permitted limit of 1.52543999 kg/d (MX WK AV)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 3.8 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Overdue
May 31, 2025
Nitrogen, ammonia total [as N]
2% over limit
Discharged 5.71 mg/L against a permitted limit of 5.6 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
41% over limit
Discharged 5.21 mg/L against a permitted limit of 3.7 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2024
Nitrogen, ammonia total [as N]
19% over limit
Discharged 4.4 mg/L against a permitted limit of 3.7 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2024
Nitrogen, ammonia total [as N]
68% over limit
Discharged 9.4 mg/L against a permitted limit of 5.6 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
81% over limit
Discharged 6.7 mg/L against a permitted limit of 3.7 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)