OUTFALLS OF THE MANA PLAIN DRAINAGE DITCH SYSTEM
NPDES ID: HI0021952
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.
Violations
March 31, 2026
Nitrogen, total [as N]
452% over limit
Discharged 1.38000007 mg/L against a permitted limit of 0.25000001 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, total [as N]
1000% over limit
Discharged 2.75000013 mg/L against a permitted limit of 0.25000001 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Enterococci
14757% over limit
Discharged 5200 MPN/100mL against a permitted limit of 35 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
Enterococci
2043% over limit
Discharged 750 MPN/100mL against a permitted limit of 35 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
158% over limit
Discharged 0.11600001 mg/L against a permitted limit of 0.045 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 6.66 SU against a permitted limit of 7 SU (DAILY MN)
DMR, Limited - Numeric Violation
Turbidity
0% over limit
Discharged 4.03 NTU against a permitted limit of 1 NTU (DAILY MX)
DMR, Limited - Numeric Violation
Pass/Fail Static Renewal 96Hr Acute Ceriodaphnia dubia
0% over limit
Discharged 1 pass=0;fail=1 against a permitted limit of 1 pass=0;fail=1 (DAILY MX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
227% over limit
Discharged 0.14700001 mg/L against a permitted limit of 0.045 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Turbidity
0% over limit
Discharged 93.6 NTU against a permitted limit of 1 NTU (DAILY MX)
DMR, Limited - Numeric Violation
Enterococci
477% over limit
Discharged 750 MPN/100mL against a permitted limit of 130 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Enterococci
3900% over limit
Discharged 5200 MPN/100mL against a permitted limit of 130 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
December 31, 2025
Enterococci
500% over limit
Discharged 210 MPN/100mL against a permitted limit of 35 MPN/100mL (MO GEOMN)
DMR, Limited - Numeric Violation
Turbidity
0% over limit
Discharged 38.2 NTU against a permitted limit of 0.5 NTU (DAILY MX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
280% over limit
Discharged 0.11400001 mg/L against a permitted limit of 0.03 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, total [as N]
833% over limit
Discharged 1.68000008 mg/L against a permitted limit of 0.18000001 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as NH4]
1940% over limit
Discharged 0.102 mg/L against a permitted limit of 0.005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Enterococci
62% over limit
Discharged 210 MPN/100mL against a permitted limit of 130 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
November 30, 2025
Nitrogen, total [as N]
1211% over limit
Discharged 2.36000011 mg/L against a permitted limit of 0.18000001 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Turbidity
0% over limit
Discharged 17 NTU against a permitted limit of 0.5 NTU (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as NH4]
746% over limit
Discharged 0.0423 mg/L against a permitted limit of 0.005 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Phosphorus, total [as P]
203% over limit
Discharged 0.091 mg/L against a permitted limit of 0.03 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)