COLORADO CITY METRO DISTRICT
NPDES ID: CO0021121
E — SNC: Effluent violation (monthly average limit)
The facility discharged more of a pollutant than its permit allows, based on a monthly average.
Violations
December 31, 2025
Mercury, total [as Hg]
0% over limit
Discharged 0 mg/L against a permitted limit of 0 mg/L (DAILY MX)
DMR, Monitor Only - Overdue
October 31, 2025
E. coli
14% over limit
Discharged 143.18 MPN/100mL against a permitted limit of 126 MPN/100mL (30DA GM)
DMR, Limited - Numeric Violation
Oil and grease
0% over limit
Discharged 0 mg/L against a permitted limit of 10 mg/L (INST MAX)
DMR, Limited - Overdue
September 30, 2025
BOD, 5-day, percent removal
560% over limit
Discharged 1 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
Oil and grease
0% over limit
Discharged 0 mg/L against a permitted limit of 10 mg/L (INST MAX)
DMR, Limited - Overdue
Solids, suspended percent removal
560% over limit
Discharged 1 % against a permitted limit of 85 % (MO AV MN)
DMR, Limited - Numeric Violation
August 31, 2025
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.12 mg/L against a permitted limit of 20 mg/L (DAILY MX)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.35 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.29 MGD against a permitted limit of 0.4 MGD (30DA AVG)
DMR, Limited - Overdue
pH
0% over limit
Discharged 7.85 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 5.08 MPN/100mL against a permitted limit of 126 MPN/100mL (30DA GM)
DMR, Limited - Overdue
Oil and grease
0% over limit
Discharged 0 mg/L against a permitted limit of 10 mg/L (INST MAX)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.25 MGD against a permitted limit of 0 MGD (30DA AVG)
DMR, Monitor Only - Overdue
Chlorine, total residual
0% over limit
Discharged 0 mg/L against a permitted limit of 0.019 mg/L (INST MAX)
DMR, Limited - Overdue
Plant capacity fact. percent of capacity
0% over limit
Discharged 0.625 % against a permitted limit of 0 % (30DA AVG)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 6.99 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 0 mg/L against a permitted limit of 0.011 mg/L (30DA AVG)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.31 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.09 mg/L against a permitted limit of 2.6 mg/L (30DA AVG)
DMR, Limited - Overdue
Oil and grease visual
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (INST MAX)
DMR, Monitor Only - Overdue
E. coli
0% over limit
Discharged 2.64 MPN/100mL against a permitted limit of 252 MPN/100mL (MX 7D GM)
DMR, Limited - Overdue
July 31, 2025
Chlorine, total residual
0% over limit
Discharged 0 mg/L against a permitted limit of 0.019 mg/L (INST MAX)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.32 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
Plant capacity fact. percent of capacity
0% over limit
Discharged 60.8 % against a permitted limit of 0 % (30DA AVG)
DMR, Monitor Only - Overdue
pH
0% over limit
Discharged 7.73 SU against a permitted limit of 9 SU (MAXIMUM)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.26 MGD against a permitted limit of 0 MGD (DAILY MX)
DMR, Monitor Only - Overdue
Oil and grease
0% over limit
Discharged 0 mg/L against a permitted limit of 10 mg/L (INST MAX)
DMR, Limited - Overdue
pH
0% over limit
Discharged 6.51 SU against a permitted limit of 6.5 SU (MINIMUM)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 53.81 MPN/100mL against a permitted limit of 252 MPN/100mL (MX 7D GM)
DMR, Limited - Overdue
Oil and grease visual
0% over limit
Discharged 0 pass=0;fail=1 against a permitted limit of 0 pass=0;fail=1 (INST MAX)
DMR, Monitor Only - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.36 mg/L against a permitted limit of 24 mg/L (DAILY MX)
DMR, Limited - Overdue
E. coli
0% over limit
Discharged 63.78 MPN/100mL against a permitted limit of 126 MPN/100mL (30DA GM)
DMR, Limited - Overdue
Chlorine, total residual
0% over limit
Discharged 0 mg/L against a permitted limit of 0.011 mg/L (30DA AVG)
DMR, Limited - Overdue
Nitrogen, ammonia total [as N]
0% over limit
Discharged 0.05 mg/L against a permitted limit of 2.8 mg/L (30DA AVG)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.28 MGD against a permitted limit of 0.4 MGD (30DA AVG)
DMR, Limited - Overdue
Flow, in conduit or thru treatment plant
0% over limit
Discharged 0.24 MGD against a permitted limit of 0 MGD (30DA AVG)
DMR, Monitor Only - Overdue
May 31, 2025
E. coli
73% over limit
Discharged 435.2 MPN/100mL against a permitted limit of 252 MPN/100mL (MX 7D GM)
DMR, Limited - Numeric Violation
November 30, 2024
E. coli
117% over limit
Discharged 547.5 MPN/100mL against a permitted limit of 252 MPN/100mL (MX 7D GM)
DMR, Limited - Numeric Violation
October 31, 2024
E. coli
315% over limit
Discharged 1046.2 MPN/100mL against a permitted limit of 252 MPN/100mL (MX 7D GM)
DMR, Limited - Numeric Violation
E. coli
88% over limit
Discharged 236.3 MPN/100mL against a permitted limit of 126 MPN/100mL (30DA GM)
DMR, Limited - Numeric Violation
September 30, 2024
E. coli
83% over limit
Discharged 461.1 MPN/100mL against a permitted limit of 252 MPN/100mL (MX 7D GM)
DMR, Limited - Numeric Violation
First flagged
April 14, 2026 (3 months ago)
Last confirmed
July 13, 2026 (22 days ago)