CENTRAL HIGH SCHOOL AND NASH MIDDLE SCHOOL STP
NPDES ID: IL0037206
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.
Violations
May 31, 2026
Nitrogen, ammonia total [as N]
80% over limit
Discharged 0.67191999 kg/d against a permitted limit of 0.37228 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
125% over limit
Discharged 0.336868 kg/d against a permitted limit of 0.14982 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
75% over limit
Discharged 0.87621999 kg/d against a permitted limit of 0.4994 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
71% over limit
Discharged 8.9 mg/L against a permitted limit of 5.2 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
134% over limit
Discharged 8.9 mg/L against a permitted limit of 3.8 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
493% over limit
Discharged 8.9 mg/L against a permitted limit of 1.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2026
BOD, carbonaceous [5 day, 20 C]
5% over limit
Discharged 21 mg/L against a permitted limit of 20 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1302% over limit
Discharged 72.9 mg/L against a permitted limit of 5.2 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
644% over limit
Discharged 2.76939998 kg/d against a permitted limit of 0.37228 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
110% over limit
Discharged 21 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
6% over limit
Discharged 2.06569998 kg/d against a permitted limit of 1.95219998 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1336% over limit
Discharged 7.17319994 kg/d against a permitted limit of 0.4994 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
4760% over limit
Discharged 72.9 mg/L against a permitted limit of 1.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1818% over limit
Discharged 72.9 mg/L against a permitted limit of 3.8 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1739% over limit
Discharged 2.75577998 kg/d against a permitted limit of 0.14982 kg/d (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Solids, total suspended
21% over limit
Discharged 2.85111998 kg/d against a permitted limit of 2.36079998 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
142% over limit
Discharged 29 mg/L against a permitted limit of 12 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
977% over limit
Discharged 5.86567995 kg/d against a permitted limit of 0.5448 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
21% over limit
Discharged 29 mg/L against a permitted limit of 24 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
946% over limit
Discharged 59.6 mg/L against a permitted limit of 5.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
788% over limit
Discharged 2.25637998 kg/d against a permitted limit of 0.25424 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
2192% over limit
Discharged 59.6 mg/L against a permitted limit of 2.6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Nitrogen, ammonia total [as N]
307% over limit
Discharged 1.03511999 kg/d against a permitted limit of 0.25424 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
50% over limit
Discharged 18 mg/L against a permitted limit of 12 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
954% over limit
Discharged 27.4 mg/L against a permitted limit of 2.6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
381% over limit
Discharged 27.4 mg/L against a permitted limit of 5.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
20% over limit
Discharged 12 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
392% over limit
Discharged 2.67859998 kg/d against a permitted limit of 0.5448 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
October 31, 2025
Nitrogen, ammonia total [as N]
99% over limit
Discharged 0.74001999 kg/d against a permitted limit of 0.37228 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
277% over limit
Discharged 19.6 mg/L against a permitted limit of 5.2 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1207% over limit
Discharged 19.6 mg/L against a permitted limit of 1.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
394% over limit
Discharged 0.74001999 kg/d against a permitted limit of 0.14982 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
286% over limit
Discharged 1.92949998 kg/d against a permitted limit of 0.4994 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
416% over limit
Discharged 19.6 mg/L against a permitted limit of 3.8 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
March 31, 2025
BOD, carbonaceous [5 day, 20 C]
200% over limit
Discharged 30 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
56% over limit
Discharged 5.91 mg/L against a permitted limit of 3.8 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
16% over limit
Discharged 0.58112 kg/d against a permitted limit of 0.4994 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
14% over limit
Discharged 1.13499999 kg/d against a permitted limit of 0.99879999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
294% over limit
Discharged 5.91 mg/L against a permitted limit of 1.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
14% over limit
Discharged 5.91 mg/L against a permitted limit of 5.2 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
51% over limit
Discharged 2.95099998 kg/d against a permitted limit of 1.95219998 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
50% over limit
Discharged 30 mg/L against a permitted limit of 20 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
7% over limit
Discharged 0.39952 kg/d against a permitted limit of 0.37228 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
48% over limit
Discharged 0.22246 kg/d against a permitted limit of 0.14982 kg/d (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Nitrogen, ammonia total [as N]
946% over limit
Discharged 59.6 mg/L against a permitted limit of 5.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
166% over limit
Discharged 0.67691399 kg/d against a permitted limit of 0.25424 kg/d (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
380% over limit
Discharged 48 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
28% over limit
Discharged 0.69915999 kg/d against a permitted limit of 0.5448 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Solids, total suspended
67% over limit
Discharged 20 mg/L against a permitted limit of 12 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
2192% over limit
Discharged 59.6 mg/L against a permitted limit of 2.6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
140% over limit
Discharged 48 mg/L against a permitted limit of 20 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2025
Nitrogen, ammonia total [as N]
0% over limit
Discharged 5.71 mg/L against a permitted limit of 5.7 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
120% over limit
Discharged 5.71 mg/L against a permitted limit of 2.6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2024
Nitrogen, ammonia total [as N]
70% over limit
Discharged 4.41 mg/L against a permitted limit of 2.6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
November 30, 2024
Nitrogen, ammonia total [as N]
27% over limit
Discharged 3.29 mg/L against a permitted limit of 2.6 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2024
Nitrogen, ammonia total [as N]
353% over limit
Discharged 17.2 mg/L against a permitted limit of 3.8 mg/L (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
40% over limit
Discharged 28 mg/L against a permitted limit of 20 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
41% over limit
Discharged 2.75577998 kg/d against a permitted limit of 1.95219998 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
239% over limit
Discharged 1.69341999 kg/d against a permitted limit of 0.4994 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
231% over limit
Discharged 17.2 mg/L against a permitted limit of 5.2 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
333% over limit
Discharged 0.64921999 kg/d against a permitted limit of 0.14982 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
1047% over limit
Discharged 17.2 mg/L against a permitted limit of 1.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
5% over limit
Discharged 0.39044 kg/d against a permitted limit of 0.37228 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
180% over limit
Discharged 28 mg/L against a permitted limit of 10 mg/L (MO AVG)
DMR, Limited - Numeric Violation
BOD, carbonaceous [5 day, 20 C]
5% over limit
Discharged 1.04419999 kg/d against a permitted limit of 0.99879999 kg/d (MO AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Nitrogen, ammonia total [as N]
147% over limit
Discharged 3.71 mg/L against a permitted limit of 1.5 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (5 days ago)