PALO VERDE UTILITIES CO - WRF
NPDES ID: AZ0025071
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 single-event violations.
Violations
March 31, 2026
Chlorine, total residual
667% over limit
Discharged 0.069 mg/L against a permitted limit of 0.009 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
790% over limit
Discharged 0.93460004 kg/d against a permitted limit of 0.105 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
3806% over limit
Discharged 16.01400076 kg/d against a permitted limit of 0.41000002 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
321% over limit
Discharged 2419.6 MPN/100mL against a permitted limit of 575 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Chlorine, total residual
4811% over limit
Discharged 0.88400004 mg/L against a permitted limit of 0.018 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
February 28, 2026
Chlorine, total residual
5687% over limit
Discharged 23.72600113 kg/d against a permitted limit of 0.41000002 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Chlorine, total residual
5056% over limit
Discharged 0.46400002 mg/L against a permitted limit of 0.009 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Cyanide, total [as CN]
24% over limit
Discharged 0.16100001 kg/d against a permitted limit of 0.13000001 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
26% over limit
Discharged 214.5 kg/d against a permitted limit of 170.3 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
4706% over limit
Discharged 0.86500004 mg/L against a permitted limit of 0.018 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Chlorine, total residual
11716% over limit
Discharged 12.40700059 kg/d against a permitted limit of 0.105 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Cyanide, total [as CN]
87% over limit
Discharged 0.24300001 kg/d against a permitted limit of 0.13000001 kg/d (MO AVG)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
1820% over limit
Discharged 2419.6 MPN/100mL against a permitted limit of 126 MPN/100mL (MO AVG)
DMR, Limited - Numeric Violation
Cyanide, total [as CN]
141% over limit
Discharged 0.014 mg/L against a permitted limit of 0.0058 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
7856% over limit
Discharged 0.71600003 mg/L against a permitted limit of 0.009 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
6414% over limit
Discharged 26.70600127 kg/d against a permitted limit of 0.41000002 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Chlorine, total residual
2221% over limit
Discharged 9.51430045 kg/d against a permitted limit of 0.41000002 kg/d (DAILY MX)
DMR, Limited - Numeric Violation
Chlorine, total residual
7556% over limit
Discharged 1.37800007 mg/L against a permitted limit of 0.018 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
Cyanide, total [as CN]
141% over limit
Discharged 0.014 mg/L against a permitted limit of 0.0058 mg/L (MO AVG)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
321% over limit
Discharged 2419.6 MPN/100mL against a permitted limit of 575 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Cyanide, total [as CN]
141% over limit
Discharged 0.014 mg/L against a permitted limit of 0.0058 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
98% over limit
Discharged 337.9 kg/d against a permitted limit of 170.3 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
9511% over limit
Discharged 0.86500004 mg/L against a permitted limit of 0.009 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
32% over limit
Discharged 224.5 kg/d against a permitted limit of 170.3 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Cyanide, total [as CN]
18% over limit
Discharged 0.15400001 kg/d against a permitted limit of 0.13000001 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
4992% over limit
Discharged 5.34700025 kg/d against a permitted limit of 0.105 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
8961% over limit
Discharged 9.51430045 kg/d against a permitted limit of 0.105 kg/d (MO AVG)
DMR, Limited - Numeric Violation
Solids, total suspended
32% over limit
Discharged 337.9 kg/d against a permitted limit of 255.5 kg/d (WKLY AVG)
DMR, Limited - Numeric Violation
E. coli, colony forming units [CFU]
321% over limit
Discharged 2419.6 MPN/100mL against a permitted limit of 575 MPN/100mL (DAILY MX)
DMR, Limited - Numeric Violation
Chlorine, total residual
7483% over limit
Discharged 1.36500006 mg/L against a permitted limit of 0.018 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
January 31, 2026
Chlorine, total residual
0% over limit
Discharged 0 kg/d against a permitted limit of 0.105 kg/d (MO AVG)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 0 mg/L against a permitted limit of 0.009 mg/L (MO AVG)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 0 mg/L against a permitted limit of 0.018 mg/L (DAILY MX)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
130% over limit
Discharged 2300000 mg/L against a permitted limit of 1000000 mg/L (MO AVG)
DMR, Limited - Numeric Violation
Chlorine, total residual
0% over limit
Discharged 0 kg/d against a permitted limit of 0.41000002 kg/d (DAILY MX)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
140% over limit
Discharged 4800000 mg/L against a permitted limit of 2000000 mg/L (DAILY MX)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (23 days ago)