HILLSDALE STP, VILLAGE OF
NPDES ID: ILG580009
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: 3 effluent violations.
Violations
April 30, 2026
Solids, total suspended
7% over limit
Discharged 47.6699996 kg/d against a permitted limit of 44.49199963 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
73% over limit
Discharged 78 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
111% over limit
Discharged 78 mg/L against a permitted limit of 37 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2026
BOD, carbonaceous [5 day, 20 C]
4% over limit
Discharged 26 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
84% over limit
Discharged 68 mg/L against a permitted limit of 37 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
51% over limit
Discharged 68 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Solids, total suspended
18% over limit
Discharged 53 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
43% over limit
Discharged 53 mg/L against a permitted limit of 37 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2025
BOD, carbonaceous [5 day, 20 C]
4% over limit
Discharged 26 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Solids, total suspended
51% over limit
Discharged 68 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
84% over limit
Discharged 68 mg/L against a permitted limit of 37 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Solids, total suspended
92% over limit
Discharged 71 mg/L against a permitted limit of 37 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
58% over limit
Discharged 71 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
March 31, 2025
Solids, total suspended
78% over limit
Discharged 66 mg/L against a permitted limit of 37 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
47% over limit
Discharged 66 mg/L against a permitted limit of 45 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
32% over limit
Discharged 33 mg/L against a permitted limit of 25 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (5 days ago)