GRANTSVILLE WWTP
NPDES ID: MD0020761
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: 21 effluent violations.
Violations
June 30, 2026
Nitrogen, ammonia total [as N]
439% over limit
Discharged 21.01 mg/L against a permitted limit of 3.9 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
pH
0% over limit
Discharged 6.47 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
3% over limit
Discharged 30.81 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
172% over limit
Discharged 25.6 mg/L against a permitted limit of 9.4 mg/L (MX DA AV)
DMR, Limited - Numeric Violation
E. coli
1820% over limit
Discharged 2419.6 MPN/100mL against a permitted limit of 126 MPN/100mL (MX MO GMN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
322% over limit
Discharged 38.34483968 kg/d against a permitted limit of 9.07999992 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
186% over limit
Discharged 61.06299949 kg/d against a permitted limit of 21.33799982 kg/d (MX DA AV)
DMR, Limited - Numeric Violation
May 31, 2026
Nitrogen, ammonia total [as N]
690% over limit
Discharged 71.7229194 kg/d against a permitted limit of 9.07999992 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
610% over limit
Discharged 151.44077873 kg/d against a permitted limit of 21.33799982 kg/d (MX DA AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
65% over limit
Discharged 112.06535906 kg/d against a permitted limit of 68.09999943 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
Solids, total suspended
15% over limit
Discharged 78.59647934 kg/d against a permitted limit of 68.09999943 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
27% over limit
Discharged 38.14 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
251% over limit
Discharged 33 mg/L against a permitted limit of 9.4 mg/L (MX DA AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
526% over limit
Discharged 24.4 mg/L against a permitted limit of 3.9 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
E. coli
1820% over limit
Discharged 2419.6 MPN/100mL against a permitted limit of 126 MPN/100mL (MX MO GMN)
DMR, Limited - Numeric Violation
April 30, 2026
BOD, 5-day, 20 deg. C
44% over limit
Discharged 43.2 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
E. coli
1820% over limit
Discharged 2419.6 MPN/100mL against a permitted limit of 126 MPN/100mL (MX MO GMN)
DMR, Limited - Numeric Violation
Solids, total suspended
15% over limit
Discharged 34.37 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
75% over limit
Discharged 119.406539 kg/d against a permitted limit of 68.09999943 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
14% over limit
Discharged 51.5 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
40% over limit
Discharged 94.9994992 kg/d against a permitted limit of 68.09999943 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
March 31, 2026
BOD, 5-day, 20 deg. C
19% over limit
Discharged 81.29777932 kg/d against a permitted limit of 68.09999943 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
E. coli
1820% over limit
Discharged 2419.6 MPN/100mL against a permitted limit of 126 MPN/100mL (MX MO GMN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
0% over limit
Discharged 30.03 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
February 28, 2026
E. coli
1820% over limit
Discharged 2419.6 MPN/100mL against a permitted limit of 126 MPN/100mL (MX MO GMN)
DMR, Limited - Numeric Violation
January 31, 2026
Solids, total suspended
7% over limit
Discharged 32.21 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
E. coli
517% over limit
Discharged 777.75 MPN/100mL against a permitted limit of 126 MPN/100mL (MX MO GMN)
DMR, Limited - Numeric Violation
December 31, 2025
E. coli
148% over limit
Discharged 312.98 MPN/100mL against a permitted limit of 126 MPN/100mL (MX MO GMN)
DMR, Limited - Numeric Violation
October 31, 2025
E. coli
37% over limit
Discharged 172.53 MPN/100mL against a permitted limit of 126 MPN/100mL (MX MO GMN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
181% over limit
Discharged 25.50571979 kg/d against a permitted limit of 9.07999992 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
202% over limit
Discharged 28.4 mg/L against a permitted limit of 9.4 mg/L (MX DA AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
498% over limit
Discharged 23.31 mg/L against a permitted limit of 3.9 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
109% over limit
Discharged 44.62819963 kg/d against a permitted limit of 21.33799982 kg/d (MX DA AV)
DMR, Limited - Numeric Violation
September 30, 2025
Nitrogen, ammonia total [as N]
26% over limit
Discharged 11.4090199 kg/d against a permitted limit of 9.07999992 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
307% over limit
Discharged 15.86 mg/L against a permitted limit of 3.9 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
80% over limit
Discharged 16.95 mg/L against a permitted limit of 9.4 mg/L (MX DA AV)
DMR, Limited - Numeric Violation
August 31, 2025
Nitrogen, ammonia total [as N]
42% over limit
Discharged 13.35 mg/L against a permitted limit of 9.4 mg/L (MX DA AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
196% over limit
Discharged 11.55 mg/L against a permitted limit of 3.9 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
84% over limit
Discharged 16.74805986 kg/d against a permitted limit of 9.07999992 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
32% over limit
Discharged 28.10259976 kg/d against a permitted limit of 21.33799982 kg/d (MX DA AV)
DMR, Limited - Numeric Violation
July 31, 2025
Nitrogen, ammonia total [as N]
5% over limit
Discharged 9.55669992 kg/d against a permitted limit of 9.07999992 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
140% over limit
Discharged 22.6 mg/L against a permitted limit of 9.4 mg/L (MX DA AV)
DMR, Limited - Numeric Violation
Solids, total suspended
23% over limit
Discharged 55.25 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
4% over limit
Discharged 46.85 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
132% over limit
Discharged 49.45875958 kg/d against a permitted limit of 21.33799982 kg/d (MX DA AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
341% over limit
Discharged 17.18 mg/L against a permitted limit of 3.9 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
June 30, 2025
Nitrogen, ammonia total [as N]
370% over limit
Discharged 42.67599964 kg/d against a permitted limit of 9.07999992 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
58% over limit
Discharged 71.3 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
149% over limit
Discharged 23.4 mg/L against a permitted limit of 9.4 mg/L (MX DA AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
125% over limit
Discharged 153.00253871 kg/d against a permitted limit of 68.09999943 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
Solids, total suspended
48% over limit
Discharged 100.51559916 kg/d against a permitted limit of 68.09999943 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
72% over limit
Discharged 51.74 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
E. coli
442% over limit
Discharged 682.68 MPN/100mL against a permitted limit of 126 MPN/100mL (MX MO GMN)
DMR, Limited - Numeric Violation
Solids, total suspended
13% over limit
Discharged 33.99 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
270% over limit
Discharged 14.43 mg/L against a permitted limit of 3.9 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Solids, total suspended
7% over limit
Discharged 48 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
387% over limit
Discharged 103.92967913 kg/d against a permitted limit of 21.33799982 kg/d (MX DA AV)
DMR, Limited - Numeric Violation
May 31, 2025
Solids, total suspended
7% over limit
Discharged 48.33 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
58% over limit
Discharged 161.72387864 kg/d against a permitted limit of 102.14999914 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
66% over limit
Discharged 49.85 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
299% over limit
Discharged 15.58 mg/L against a permitted limit of 3.9 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
67% over limit
Discharged 75.33 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
86% over limit
Discharged 126.95655893 kg/d against a permitted limit of 68.09999943 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
E. coli
1119% over limit
Discharged 1535.32 MPN/100mL against a permitted limit of 126 MPN/100mL (MX MO GMN)
DMR, Limited - Numeric Violation
Solids, total suspended
2% over limit
Discharged 103.75715913 kg/d against a permitted limit of 102.14999914 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
16% over limit
Discharged 34.71 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
528% over limit
Discharged 56.98607952 kg/d against a permitted limit of 9.07999992 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
172% over limit
Discharged 25.6 mg/L against a permitted limit of 9.4 mg/L (MX DA AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
552% over limit
Discharged 139.19185883 kg/d against a permitted limit of 21.33799982 kg/d (MX DA AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
168% over limit
Discharged 182.33093847 kg/d against a permitted limit of 68.09999943 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
April 30, 2025
BOD, 5-day, 20 deg. C
403% over limit
Discharged 226.5 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
92% over limit
Discharged 196.39131835 kg/d against a permitted limit of 102.14999914 kg/d (MX WK AV)
DMR, Limited - Numeric Violation
Solids, total suspended
106% over limit
Discharged 92.5 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
125% over limit
Discharged 153.29763871 kg/d against a permitted limit of 68.09999943 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
153% over limit
Discharged 75.96 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Solids, total suspended
9% over limit
Discharged 32.66 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
E. coli
1820% over limit
Discharged 2419.6 MPN/100mL against a permitted limit of 126 MPN/100mL (MX MO GMN)
DMR, Limited - Numeric Violation
March 31, 2025
E. coli
1820% over limit
Discharged 2419.6 MPN/100mL against a permitted limit of 126 MPN/100mL (MX MO GMN)
DMR, Limited - Numeric Violation
February 28, 2025
BOD, 5-day, 20 deg. C
2% over limit
Discharged 69.14419942 kg/d against a permitted limit of 68.09999943 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
E. coli
1820% over limit
Discharged 2419.6 MPN/100mL against a permitted limit of 126 MPN/100mL (MX MO GMN)
DMR, Limited - Numeric Violation
January 31, 2025
E. coli
1820% over limit
Discharged 2419.6 MPN/100mL against a permitted limit of 126 MPN/100mL (MX MO GMN)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
31% over limit
Discharged 39.23 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
12% over limit
Discharged 50.5 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
December 31, 2024
E. coli
1444% over limit
Discharged 1945.44 MPN/100mL against a permitted limit of 126 MPN/100mL (MX MO GMN)
DMR, Limited - Numeric Violation
November 30, 2024
E. coli
284% over limit
Discharged 484.15 MPN/100mL against a permitted limit of 126 MPN/100mL (MX MO GMN)
DMR, Limited - Numeric Violation
October 31, 2024
Solids, total suspended
30% over limit
Discharged 38.87 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Solids, total suspended
26% over limit
Discharged 56.9 mg/L against a permitted limit of 45 mg/L (MX WK AV)
DMR, Limited - Numeric Violation
BOD, 5-day, 20 deg. C
16% over limit
Discharged 34.88 mg/L against a permitted limit of 30 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
206% over limit
Discharged 28.8 mg/L against a permitted limit of 9.4 mg/L (MX DA AV)
DMR, Limited - Numeric Violation
E. coli
257% over limit
Discharged 449.75 MPN/100mL against a permitted limit of 126 MPN/100mL (MX MO GMN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
327% over limit
Discharged 16.66 mg/L against a permitted limit of 3.9 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
115% over limit
Discharged 19.49021984 kg/d against a permitted limit of 9.07999992 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
125% over limit
Discharged 47.9787196 kg/d against a permitted limit of 21.33799982 kg/d (MX DA AV)
DMR, Limited - Numeric Violation
September 30, 2024
Nitrogen, ammonia total [as N]
153% over limit
Discharged 23.8 mg/L against a permitted limit of 9.4 mg/L (MX DA AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
55% over limit
Discharged 14.10123988 kg/d against a permitted limit of 9.07999992 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
397% over limit
Discharged 19.4 mg/L against a permitted limit of 3.9 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
August 31, 2024
E. coli
175% over limit
Discharged 346.4 MPN/100mL against a permitted limit of 126 MPN/100mL (MX MO GMN)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
836% over limit
Discharged 36.5 mg/L against a permitted limit of 3.9 mg/L (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
383% over limit
Discharged 43.81099963 kg/d against a permitted limit of 9.07999992 kg/d (MX MO AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
439% over limit
Discharged 50.7 mg/L against a permitted limit of 9.4 mg/L (MX DA AV)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
330% over limit
Discharged 91.75339923 kg/d against a permitted limit of 21.33799982 kg/d (MX DA AV)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 15, 2026 (6 hours ago)