DNR LEDGES STATE PARK
NPDES ID: IA0077127
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: 4 effluent violations.
Violations
April 30, 2026
Chlorine, total residual
1% over limit
Discharged 0.00118676 kg/d against a permitted limit of 0.0011804 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Chlorine, total residual
183% over limit
Discharged 0.15 mg/L against a permitted limit of 0.053 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chlorine, total residual
32% over limit
Discharged 0.07 mg/L against a permitted limit of 0.053 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 9.3 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Numeric Violation
March 31, 2026
Chlorine, total residual
164% over limit
Discharged 0.14 mg/L against a permitted limit of 0.053 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 9.8 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Numeric Violation
Chlorine, total residual
4% over limit
Discharged 0.055 mg/L against a permitted limit of 0.053 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
February 28, 2026
pH
0% over limit
Discharged 9.1 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Numeric Violation
August 31, 2025
Nitrogen, ammonia total [as N]
18% over limit
Discharged 0.16120723 kg/d against a permitted limit of 0.1362 kg/d (30DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
18% over limit
Discharged 0.16120723 kg/d against a permitted limit of 0.1362 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
3% over limit
Discharged 7.1 mg/L against a permitted limit of 6.9 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
3% over limit
Discharged 7.1 mg/L against a permitted limit of 6.9 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Chlorine, total residual
4% over limit
Discharged 0.00122762 kg/d against a permitted limit of 0.0011804 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
April 30, 2025
Oxygen, dissolved [DO]
0% over limit
Discharged 0 mg/L against a permitted limit of 1 mg/L (DAILY MN)
DMR, Limited - Overdue
August 31, 2024
Nitrogen, ammonia total [as N]
41% over limit
Discharged 9.7 mg/L against a permitted limit of 6.9 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
41% over limit
Discharged 9.7 mg/L against a permitted limit of 6.9 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
July 31, 2024
Nitrogen, ammonia total [as N]
0% over limit
Discharged 5 mg/L against a permitted limit of 8.3 mg/L (DAILY MX)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 0 kg/d against a permitted limit of 0.0011804 kg/d (30DA AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 3 mg/L against a permitted limit of 80 mg/L (30DA 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 (30DA AVG)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 79.64085 MPN/100mL against a permitted limit of 3026 MPN/100mL (GEO MEAN)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.00588747 kg/d against a permitted limit of 0.1816 kg/d (30DA AVG)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 0 kg/d against a permitted limit of 0.5448 kg/d (30DA AVG)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.00588747 kg/d against a permitted limit of 0.1816 kg/d (DAILY MX)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 330 MPN/100mL against a permitted limit of 5643 MPN/100mL (DAILY MX)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0.00353257 kg/d against a permitted limit of 2.67859998 kg/d (7 DA AVG)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 0 mg/L against a permitted limit of 0.053 mg/L (DAILY MX)
DMR, Limited - Overdue
pH
0% over limit
Discharged 7.5 SU against a permitted limit of 9 SU (DAILY MX)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 5 mg/L against a permitted limit of 8.3 mg/L (30DA AVG)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 3 mg/L against a permitted limit of 120 mg/L (7 DA AVG)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 0 kg/d against a permitted limit of 0.90799999 kg/d (7 DA AVG)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 0 kg/d against a permitted limit of 0.0011804 kg/d (DAILY MX)
DMR, Limited - Overdue
BOD, carbonaceous [5 day, 20 C]
0% over limit
Discharged 0 mg/L against a permitted limit of 40 mg/L (7 DA AVG)
DMR, Limited - Overdue
pH
0% over limit
Discharged 7.5 SU against a permitted limit of 6 SU (DAILY MN)
DMR, Limited - Overdue
Solids, total suspended
0% over limit
Discharged 0.00353257 kg/d against a permitted limit of 1.77059999 kg/d (30DA AVG)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 0 mg/L against a permitted limit of 0.053 mg/L (30DA AVG)
DMR, Limited - Overdue
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)