FRISCO SANITATION DISTRICT WWTF
NPDES ID: CO0020451
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: 4 permit schedule violations.
Violations
February 28, 2026
Temperature, water deg. centigrade
0% over limit
Discharged 3.44 deg C against a permitted limit of 0 deg C (MX WK AV)
DMR, Monitor Only - Overdue
Temperature, water deg. centigrade
0% over limit
Discharged 3.82 deg C against a permitted limit of 0 deg C (DAILY MX)
DMR, Monitor Only - Overdue
January 31, 2026
Temperature, water deg. centigrade
0% over limit
Discharged 4.07 deg C against a permitted limit of 0 deg C (MX WK AV)
DMR, Monitor Only - Overdue
Zinc, potentially dissolved
1% over limit
Discharged 0.0543 mg/L against a permitted limit of 0.054 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Temperature, water deg. centigrade
0% over limit
Discharged 4.78 deg C against a permitted limit of 0 deg C (DAILY MX)
DMR, Monitor Only - Overdue
Chloride [as Cl]
111% over limit
Discharged 118 mg/L against a permitted limit of 56 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
December 31, 2025
Temperature, water deg. centigrade
0% over limit
Discharged 4.67 deg C against a permitted limit of 0 deg C (DAILY MX)
DMR, Monitor Only - Overdue
Chloride [as Cl]
104% over limit
Discharged 114 mg/L against a permitted limit of 56 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Temperature, water deg. centigrade
0% over limit
Discharged 4.11 deg C against a permitted limit of 0 deg C (MX WK AV)
DMR, Monitor Only - Overdue
November 30, 2025
Temperature, water deg. centigrade
0% over limit
Discharged 8.89 deg C against a permitted limit of 0 deg C (DAILY MX)
DMR, Monitor Only - Overdue
Zinc, potentially dissolved
1% over limit
Discharged 0.0545 mg/L against a permitted limit of 0.054 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Temperature, water deg. centigrade
0% over limit
Discharged 8.32 deg C against a permitted limit of 0 deg C (MX WK AV)
DMR, Monitor Only - Overdue
Chloride [as Cl]
54% over limit
Discharged 86.4 mg/L against a permitted limit of 56 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
October 31, 2025
Chloride [as Cl]
37% over limit
Discharged 76.6 mg/L against a permitted limit of 56 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
September 30, 2025
Chloride [as Cl]
40% over limit
Discharged 78.4 mg/L against a permitted limit of 56 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
August 31, 2025
Zinc, potentially dissolved
25% over limit
Discharged 0.0675 mg/L against a permitted limit of 0.054 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
44% over limit
Discharged 80.4 mg/L against a permitted limit of 56 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
July 31, 2025
Zinc, potentially dissolved
18% over limit
Discharged 0.0638 mg/L against a permitted limit of 0.054 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
55% over limit
Discharged 87 mg/L against a permitted limit of 56 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
June 30, 2025
Chloride [as Cl]
56% over limit
Discharged 87.3 mg/L against a permitted limit of 56 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
May 31, 2025
Chloride [as Cl]
105% over limit
Discharged 115 mg/L against a permitted limit of 56 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
April 30, 2025
Chloride [as Cl]
168% over limit
Discharged 150 mg/L against a permitted limit of 56 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
March 31, 2025
Zinc, potentially dissolved
32% over limit
Discharged 0.0712 mg/L against a permitted limit of 0.054 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Temperature, water deg. centigrade
0% over limit
Discharged 2.93 deg C against a permitted limit of 0 deg C (MX WK AV)
DMR, Monitor Only - Overdue
Temperature, water deg. centigrade
0% over limit
Discharged 4.16 deg C against a permitted limit of 0 deg C (DAILY MX)
DMR, Monitor Only - Overdue
Chloride [as Cl]
145% over limit
Discharged 137 mg/L against a permitted limit of 56 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
February 28, 2025
Temperature, water deg. centigrade
0% over limit
Discharged 2.28 deg C against a permitted limit of 0 deg C (MX WK AV)
DMR, Monitor Only - Overdue
Temperature, water deg. centigrade
0% over limit
Discharged 2.71 deg C against a permitted limit of 0 deg C (DAILY MX)
DMR, Monitor Only - Overdue
Chloride [as Cl]
102% over limit
Discharged 113 mg/L against a permitted limit of 56 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Zinc, potentially dissolved
7% over limit
Discharged 0.0578 mg/L against a permitted limit of 0.054 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
January 31, 2025
Temperature, water deg. centigrade
0% over limit
Discharged 2.35 deg C against a permitted limit of 0 deg C (MX WK AV)
DMR, Monitor Only - Overdue
Chloride [as Cl]
148% over limit
Discharged 139 mg/L against a permitted limit of 56 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Temperature, water deg. centigrade
0% over limit
Discharged 2.4 deg C against a permitted limit of 0 deg C (DAILY MX)
DMR, Monitor Only - Overdue
December 31, 2024
Chloride [as Cl]
86% over limit
Discharged 104 mg/L against a permitted limit of 56 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Temperature, water deg. centigrade
0% over limit
Discharged 4.32 deg C against a permitted limit of 0 deg C (DAILY MX)
DMR, Monitor Only - Overdue
Temperature, water deg. centigrade
0% over limit
Discharged 3.96 deg C against a permitted limit of 0 deg C (MX WK AV)
DMR, Monitor Only - Overdue
November 30, 2024
Temperature, water deg. centigrade
0% over limit
Discharged 11.94 deg C against a permitted limit of 0 deg C (DAILY MX)
DMR, Monitor Only - Overdue
Chloride [as Cl]
64% over limit
Discharged 92 mg/L against a permitted limit of 56 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Temperature, water deg. centigrade
0% over limit
Discharged 11.91 deg C against a permitted limit of 0 deg C (MX WK AV)
DMR, Monitor Only - Overdue
October 31, 2024
Temperature, water deg. centigrade
0% over limit
Discharged 13.74 deg C against a permitted limit of 0 deg C (MX WK AV)
DMR, Monitor Only - Overdue
Temperature, water deg. centigrade
0% over limit
Discharged 13.77 deg C against a permitted limit of 0 deg C (DAILY MX)
DMR, Monitor Only - Overdue
Chloride [as Cl]
54% over limit
Discharged 86.3 mg/L against a permitted limit of 56 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Zinc, potentially dissolved
7% over limit
Discharged 0.0577 mg/L against a permitted limit of 0.054 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
September 30, 2024
Temperature, water deg. centigrade
0% over limit
Discharged 17.23 deg C against a permitted limit of 0 deg C (MX WK AV)
DMR, Monitor Only - Overdue
Chloride [as Cl]
34% over limit
Discharged 75.1 mg/L against a permitted limit of 56 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Temperature, water deg. centigrade
0% over limit
Discharged 17.77 deg C against a permitted limit of 0 deg C (DAILY MX)
DMR, Monitor Only - Overdue
Zinc, potentially dissolved
17% over limit
Discharged 0.0634 mg/L against a permitted limit of 0.054 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
August 31, 2024
Zinc, potentially dissolved
34% over limit
Discharged 0.0724 mg/L against a permitted limit of 0.054 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
Chloride [as Cl]
38% over limit
Discharged 77.3 mg/L against a permitted limit of 56 mg/L (30DA AVG)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
August 1, 2026 (5 days ago)