NORPHLET, CITY OF - NORPHLET WASTEWATER TREATMENT SYSTEM
NPDES ID: AR0035653
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: 10 effluent violations.
Violations
June 30, 2026
Chloride [as Cl]
18% over limit
Discharged 124 mg/L against a permitted limit of 105 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
299% over limit
Discharged 9.7 mg/L against a permitted limit of 2.43 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
77% over limit
Discharged 124 mg/L against a permitted limit of 70 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
166% over limit
Discharged 9.7 mg/L against a permitted limit of 3.65 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
May 31, 2026
Chloride [as Cl]
35% over limit
Discharged 142 mg/L against a permitted limit of 105 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
11% over limit
Discharged 4.05 mg/L against a permitted limit of 3.65 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
91% over limit
Discharged 134 mg/L against a permitted limit of 70 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
52% over limit
Discharged 3.69 mg/L against a permitted limit of 2.43 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2026
Chloride [as Cl]
11% over limit
Discharged 117 mg/L against a permitted limit of 105 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
67% over limit
Discharged 117 mg/L against a permitted limit of 70 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2026
Chloride [as Cl]
46% over limit
Discharged 102.15 mg/L against a permitted limit of 70 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2026
Chloride [as Cl]
11% over limit
Discharged 117 mg/L against a permitted limit of 105 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
66% over limit
Discharged 116 mg/L against a permitted limit of 70 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2026
Chloride [as Cl]
13% over limit
Discharged 119 mg/L against a permitted limit of 105 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
68% over limit
Discharged 117.5 mg/L against a permitted limit of 70 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Chloride [as Cl]
59% over limit
Discharged 111.5 mg/L against a permitted limit of 70 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
8% over limit
Discharged 113 mg/L against a permitted limit of 105 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
November 30, 2025
Chloride [as Cl]
15% over limit
Discharged 121 mg/L against a permitted limit of 105 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
69% over limit
Discharged 118.5 mg/L against a permitted limit of 70 mg/L (MO AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Chloride [as Cl]
74% over limit
Discharged 121.5 mg/L against a permitted limit of 70 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
75% over limit
Discharged 4.25 mg/L against a permitted limit of 2.43 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
30% over limit
Discharged 4.76 mg/L against a permitted limit of 3.65 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
29% over limit
Discharged 135 mg/L against a permitted limit of 105 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Chloride [as Cl]
5% over limit
Discharged 110.5 mg/L against a permitted limit of 105 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
58% over limit
Discharged 110.5 mg/L against a permitted limit of 70 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
13% over limit
Discharged 2.75 mg/L against a permitted limit of 2.43 mg/L (MO AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Nitrogen, ammonia total [as N]
22% over limit
Discharged 4.47 mg/L against a permitted limit of 3.65 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
57% over limit
Discharged 165 mg/L against a permitted limit of 105 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
19% over limit
Discharged 2.89 mg/L against a permitted limit of 2.43 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
131% over limit
Discharged 161.5 mg/L against a permitted limit of 70 mg/L (MO AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Nitrogen, ammonia total [as N]
63% over limit
Discharged 5.95 mg/L against a permitted limit of 3.65 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
83% over limit
Discharged 128 mg/L against a permitted limit of 70 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Coliform, fecal general
10% over limit
Discharged 1095 MPN/100mL against a permitted limit of 1000 MPN/100mL (30DA GEO)
DMR, Limited - Numeric Violation
Chloride [as Cl]
34% over limit
Discharged 141 mg/L against a permitted limit of 105 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
119% over limit
Discharged 5.31 mg/L against a permitted limit of 2.43 mg/L (MO AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Chloride [as Cl]
14% over limit
Discharged 120 mg/L against a permitted limit of 105 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
45% over limit
Discharged 5.3 mg/L against a permitted limit of 3.65 mg/L (7 DA AVG)
DMR, Limited - Numeric Violation
Nitrogen, ammonia total [as N]
42% over limit
Discharged 3.45 mg/L against a permitted limit of 2.43 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
57% over limit
Discharged 109.95 mg/L against a permitted limit of 70 mg/L (MO AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Oxygen, dissolved [DO]
20% over limit
Discharged 2.4 mg/L against a permitted limit of 3 mg/L (INST MIN)
DMR, Limited - Numeric Violation
Chloride [as Cl]
16% over limit
Discharged 81.35 mg/L against a permitted limit of 70 mg/L (MO AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Chloride [as Cl]
47% over limit
Discharged 102.75 mg/L against a permitted limit of 70 mg/L (MO AVG)
DMR, Limited - Numeric Violation
March 31, 2025
Coliform, fecal general
Limit violation
Discharged 2499 MPN/100mL against a permitted limit of 2000 MPN/100mL (7 DA GEO)
DMR, Limited - Numeric Violation
Chloride [as Cl]
27% over limit
Discharged 88.75 mg/L against a permitted limit of 70 mg/L (MO AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Chloride [as Cl]
30% over limit
Discharged 90.75 mg/L against a permitted limit of 70 mg/L (MO AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Chloride [as Cl]
17% over limit
Discharged 81.75 mg/L against a permitted limit of 70 mg/L (MO AVG)
DMR, Limited - Numeric Violation
December 31, 2024
Chloride [as Cl]
10% over limit
Discharged 77.05 mg/L against a permitted limit of 70 mg/L (MO AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (4 months ago)
Last confirmed
August 15, 2026 (9 hours ago)