Water Quality in Pasco, WA (99301)

EPA violation data for public water systems serving ZIP code 99301.

216

Total Violations

Health-Based

206

Monitoring / Reporting

215

Resolved

What does this mean?

215 of 216 violations have been resolved. 10 are health-based violations, meaning contaminant levels exceeded federal safety limits. The remaining 206 are monitoring or reporting violations (missed testing deadlines or late paperwork — not necessarily a water quality issue). Not all violations mean your water is unsafe. The EPA requires reporting even for minor administrative issues.

Water systems: 86 Population served: 127,346

Violations Detail (216 total)

Contaminant	Category	MCL Limit	Measured	Date	Status	Health Effects
Revised Total Coliform Rule	Monitoring	N/A	N/A	Aug 31, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jul 31, 2025	Resolved	N/A
E. COLI	Monitoring	0	N/A	Jul 18, 2025	Active	Severe gastrointestinal illness; may be fatal in vulnerable populations
Consumer Confidence Rule	Monitoring	N/A	N/A	Jun 30, 2025	Resolved	N/A
Consumer Confidence Rule	Monitoring	N/A	N/A	Jun 30, 2025	Resolved	N/A
Arsenic	Health-Based	N/A	0.011	Jun 30, 2025	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Consumer Confidence Rule	Monitoring	N/A	N/A	Jun 30, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 31, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2025	Resolved	N/A
Nitrate	Health-Based	N/A	11.7	Mar 31, 2025	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Revised Total Coliform Rule	Monitoring	N/A	N/A	Feb 28, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Feb 28, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jan 31, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jan 31, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Nov 30, 2024	Resolved	N/A
E. COLI	Monitoring	0	N/A	Oct 7, 2024	Resolved	Severe gastrointestinal illness; may be fatal in vulnerable populations
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Aug 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2024	Resolved	N/A
Fluoride	Health-Based	N/A	4.31	Mar 31, 2024	Resolved	Bone disease (pain and tenderness of the bones); children may get mottled teeth
Nitrate	Monitoring	N/A	N/A	Mar 31, 2024	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Arsenic	Health-Based	N/A	0.0116	Mar 31, 2024	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jan 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jan 31, 2024	Resolved	N/A
Fluoride	Health-Based	N/A	4.38	Dec 31, 2023	Resolved	Bone disease (pain and tenderness of the bones); children may get mottled teeth
Nitrate	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrate	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
1,2-Dichloroethane	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
1,2-Dichloropropane	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
o-Dichlorobenzene	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
1,1,1-Trichloroethane	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Trichloroethylene	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	Liver problems; increased risk of cancer
Vinyl chloride	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	Increased risk of cancer
Carbon tetrachloride	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	Liver problems; increased risk of cancer
Tetrachloroethylene	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	Liver problems; increased risk of cancer
Benzene	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	Anemia; decrease in blood platelets; increased risk of cancer
1,2,4-Trichlorobenzene	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
cis-1,2-Dichloroethylene	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
DICHLOROMETHANE	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
p-Dichlorobenzene	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
1,1-Dichloroethylene	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
1,1,2-Trichloroethane	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
CHLOROBENZENE	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Ethylbenzene	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
trans-1,2-Dichloroethylene	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Toluene	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Styrene	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Nitrate	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrate	Health-Based	N/A	11.2	Dec 31, 2023	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrate	Health-Based	N/A	11.1	Dec 31, 2023	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Revised Total Coliform Rule	Monitoring	N/A	N/A	Nov 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Oct 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Aug 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Aug 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Aug 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jul 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jul 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 31, 2023	Resolved	N/A
Trichloroethylene	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	Liver problems; increased risk of cancer
Trichloroethylene	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	Liver problems; increased risk of cancer
o-Dichlorobenzene	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
o-Dichlorobenzene	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
CHLOROBENZENE	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Styrene	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Benzene	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	Anemia; decrease in blood platelets; increased risk of cancer
trans-1,2-Dichloroethylene	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
1,2,4-Trichlorobenzene	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
cis-1,2-Dichloroethylene	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Fluoride	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	Bone disease (pain and tenderness of the bones); children may get mottled teeth
Benzene	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	Anemia; decrease in blood platelets; increased risk of cancer
1,1-Dichloroethylene	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Fluoride	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	Bone disease (pain and tenderness of the bones); children may get mottled teeth
Toluene	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
1,1,2-Trichloroethane	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
1,2-Dichloroethane	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Ethylbenzene	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
1,2-Dichloropropane	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
1,1,1-Trichloroethane	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Vinyl chloride	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	Increased risk of cancer
Carbon tetrachloride	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	Liver problems; increased risk of cancer
1,1-Dichloroethylene	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
p-Dichlorobenzene	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
DICHLOROMETHANE	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
cis-1,2-Dichloroethylene	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Styrene	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Ethylbenzene	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Toluene	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
CHLOROBENZENE	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
1,1,2-Trichloroethane	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Tetrachloroethylene	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	Liver problems; increased risk of cancer
Tetrachloroethylene	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	Liver problems; increased risk of cancer
1,2,4-Trichlorobenzene	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Vinyl chloride	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	Increased risk of cancer
DICHLOROMETHANE	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
p-Dichlorobenzene	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
trans-1,2-Dichloroethylene	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
1,2-Dichloroethane	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
1,1,1-Trichloroethane	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
1,2-Dichloropropane	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Carbon tetrachloride	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	Liver problems; increased risk of cancer
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	N/A
Nitrate	Monitoring	N/A	N/A	Mar 31, 2023	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Revised Total Coliform Rule	Monitoring	N/A	N/A	Feb 28, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
TTHM	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Nov 30, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Oct 31, 2022	Resolved	N/A
Fluoride	Monitoring	N/A	N/A	Sep 30, 2022	Resolved	Bone disease (pain and tenderness of the bones); children may get mottled teeth
Fluoride	Monitoring	N/A	N/A	Sep 30, 2022	Resolved	Bone disease (pain and tenderness of the bones); children may get mottled teeth
Benzene	Monitoring	N/A	N/A	Sep 30, 2022	Resolved	Anemia; decrease in blood platelets; increased risk of cancer
1,1-Dichloroethylene	Monitoring	N/A	N/A	Sep 30, 2022	Resolved	N/A
CHLOROBENZENE	Monitoring	N/A	N/A	Sep 30, 2022	Resolved	N/A
DICHLOROMETHANE	Monitoring	N/A	N/A	Sep 30, 2022	Resolved	N/A
p-Dichlorobenzene	Monitoring	N/A	N/A	Sep 30, 2022	Resolved	N/A
Vinyl chloride	Monitoring	N/A	N/A	Sep 30, 2022	Resolved	Increased risk of cancer
Carbon tetrachloride	Monitoring	N/A	N/A	Sep 30, 2022	Resolved	Liver problems; increased risk of cancer
Trichloroethylene	Monitoring	N/A	N/A	Sep 30, 2022	Resolved	Liver problems; increased risk of cancer
Tetrachloroethylene	Monitoring	N/A	N/A	Sep 30, 2022	Resolved	Liver problems; increased risk of cancer
1,2,4-Trichlorobenzene	Monitoring	N/A	N/A	Sep 30, 2022	Resolved	N/A
cis-1,2-Dichloroethylene	Monitoring	N/A	N/A	Sep 30, 2022	Resolved	N/A
o-Dichlorobenzene	Monitoring	N/A	N/A	Sep 30, 2022	Resolved	N/A
1,2-Dichloroethane	Monitoring	N/A	N/A	Sep 30, 2022	Resolved	N/A
1,1,1-Trichloroethane	Monitoring	N/A	N/A	Sep 30, 2022	Resolved	N/A
1,2-Dichloropropane	Monitoring	N/A	N/A	Sep 30, 2022	Resolved	N/A
1,1,2-Trichloroethane	Monitoring	N/A	N/A	Sep 30, 2022	Resolved	N/A
Toluene	Monitoring	N/A	N/A	Sep 30, 2022	Resolved	N/A
Ethylbenzene	Monitoring	N/A	N/A	Sep 30, 2022	Resolved	N/A
trans-1,2-Dichloroethylene	Monitoring	N/A	N/A	Sep 30, 2022	Resolved	N/A
Styrene	Monitoring	N/A	N/A	Sep 30, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Aug 31, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Aug 31, 2022	Resolved	N/A
Fluoride	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	Bone disease (pain and tenderness of the bones); children may get mottled teeth
Fluoride	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	Bone disease (pain and tenderness of the bones); children may get mottled teeth
Trichloroethylene	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	Liver problems; increased risk of cancer
cis-1,2-Dichloroethylene	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
1,1,2-Trichloroethane	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
CHLOROBENZENE	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
DICHLOROMETHANE	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
o-Dichlorobenzene	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Vinyl chloride	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	Increased risk of cancer
Carbon tetrachloride	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	Liver problems; increased risk of cancer
Tetrachloroethylene	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	Liver problems; increased risk of cancer
Benzene	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	Anemia; decrease in blood platelets; increased risk of cancer
trans-1,2-Dichloroethylene	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Styrene	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Ethylbenzene	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Toluene	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
1,2-Dichloropropane	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
1,1,1-Trichloroethane	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
1,2-Dichloroethane	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
1,1-Dichloroethylene	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
p-Dichlorobenzene	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
1,2,4-Trichlorobenzene	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Nitrate	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Consumer Confidence Rule	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Nitrate	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrate	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Tetrachloroethylene	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	Liver problems; increased risk of cancer
Ethylbenzene	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
CHLOROBENZENE	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
1,1,2-Trichloroethane	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
1,2-Dichloropropane	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
1,2-Dichloroethane	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
trans-1,2-Dichloroethylene	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
1,1-Dichloroethylene	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
p-Dichlorobenzene	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
DICHLOROMETHANE	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
1,2,4-Trichlorobenzene	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Trichloroethylene	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	Liver problems; increased risk of cancer
Nitrate	Health-Based	N/A	10.6	Dec 31, 2021	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Benzene	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	Anemia; decrease in blood platelets; increased risk of cancer
TTHM	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Total Haloacetic Acids (HAA5)	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
cis-1,2-Dichloroethylene	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
1,1,1-Trichloroethane	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Styrene	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Carbon tetrachloride	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	Liver problems; increased risk of cancer
Vinyl chloride	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	Increased risk of cancer
o-Dichlorobenzene	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Toluene	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Nitrate	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrate	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Nitrate	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Nitrate	Health-Based	N/A	12.3	Dec 31, 2021	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Revised Total Coliform Rule	Monitoring	N/A	N/A	Oct 31, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jul 31, 2021	Resolved	N/A
1,2,4-Trichlorobenzene	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
Ethylbenzene	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
Toluene	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
CHLOROBENZENE	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
1,1,2-Trichloroethane	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
1,1,1-Trichloroethane	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
trans-1,2-Dichloroethylene	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
p-Dichlorobenzene	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
DICHLOROMETHANE	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
1,2-Dichloropropane	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
1,2-Dichloroethane	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
1,1-Dichloroethylene	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
Benzene	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	Anemia; decrease in blood platelets; increased risk of cancer
Vinyl chloride	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	Increased risk of cancer
Tetrachloroethylene	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	Liver problems; increased risk of cancer
Styrene	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
Trichloroethylene	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	Liver problems; increased risk of cancer
o-Dichlorobenzene	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
Carbon tetrachloride	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	Liver problems; increased risk of cancer
cis-1,2-Dichloroethylene	Monitoring	N/A	N/A	Jun 30, 2021	Resolved	N/A
Nitrate	Health-Based	N/A	14.9	Mar 31, 2021	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath

Lead & Copper Levels

Violation Timeline

2025(15)

Revised Total Coliform Rule

Aug 31Resolved

Revised Total Coliform Rule

Jul 31Resolved

E. COLI

Jul 18Active

Consumer Confidence Rule

Jun 30Resolved

Consumer Confidence Rule

Jun 30Resolved

Arsenic

Jun 30Resolved

Consumer Confidence Rule

Jun 30Resolved

Revised Total Coliform Rule

May 31Resolved

Revised Total Coliform Rule

Apr 30Resolved

Revised Total Coliform Rule

Mar 31Resolved

Nitrate

Mar 31Resolved

Revised Total Coliform Rule

Feb 28Resolved

Revised Total Coliform Rule

Feb 28Resolved

Revised Total Coliform Rule

Jan 31Resolved

Revised Total Coliform Rule

Jan 31Resolved

2024(11)

Revised Total Coliform Rule

Nov 30Resolved

E. COLI

Oct 7Resolved

Revised Total Coliform Rule

Sep 30Resolved

Revised Total Coliform Rule

Aug 31Resolved

Revised Total Coliform Rule

Jun 30Resolved

Fluoride

Mar 31Resolved

Nitrate

Mar 31Resolved

Arsenic

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Revised Total Coliform Rule

Jan 31Resolved

Revised Total Coliform Rule

Jan 31Resolved

2023(79)

Fluoride

Dec 31Resolved

Nitrate

Dec 31Resolved

Nitrate

Dec 31Resolved

1,2-Dichloroethane

Dec 31Resolved

1,2-Dichloropropane

Dec 31Resolved

o-Dichlorobenzene

Dec 31Resolved

1,1,1-Trichloroethane

Dec 31Resolved

Trichloroethylene

Dec 31Resolved

Vinyl chloride

Dec 31Resolved

Carbon tetrachloride

Dec 31Resolved

Tetrachloroethylene

Dec 31Resolved

Benzene

Dec 31Resolved

1,2,4-Trichlorobenzene

Dec 31Resolved

cis-1,2-Dichloroethylene

Dec 31Resolved

DICHLOROMETHANE

Dec 31Resolved

p-Dichlorobenzene

Dec 31Resolved

1,1-Dichloroethylene

Dec 31Resolved

1,1,2-Trichloroethane

Dec 31Resolved

CHLOROBENZENE

Dec 31Resolved

Ethylbenzene

Dec 31Resolved

trans-1,2-Dichloroethylene

Dec 31Resolved

Toluene

Dec 31Resolved

Styrene

Dec 31Resolved

Nitrate

Dec 31Resolved

Nitrate

Dec 31Resolved

Nitrate

Dec 31Resolved

Revised Total Coliform Rule

Nov 30Resolved

Revised Total Coliform Rule

Oct 31Resolved

Revised Total Coliform Rule

Aug 31Resolved

Revised Total Coliform Rule

Aug 31Resolved

Revised Total Coliform Rule

Aug 31Resolved

Revised Total Coliform Rule

Jul 31Resolved

Revised Total Coliform Rule

Jul 31Resolved

Revised Total Coliform Rule

May 31Resolved

Trichloroethylene

Mar 31Resolved

Trichloroethylene

Mar 31Resolved

o-Dichlorobenzene

Mar 31Resolved

o-Dichlorobenzene

Mar 31Resolved

CHLOROBENZENE

Mar 31Resolved

Styrene

Mar 31Resolved

Benzene

Mar 31Resolved

trans-1,2-Dichloroethylene

Mar 31Resolved

1,2,4-Trichlorobenzene

Mar 31Resolved

cis-1,2-Dichloroethylene

Mar 31Resolved

Fluoride

Mar 31Resolved

Benzene

Mar 31Resolved

1,1-Dichloroethylene

Mar 31Resolved

Fluoride

Mar 31Resolved

Toluene

Mar 31Resolved

1,1,2-Trichloroethane

Mar 31Resolved

1,2-Dichloroethane

Mar 31Resolved

Ethylbenzene

Mar 31Resolved

1,2-Dichloropropane

Mar 31Resolved

1,1,1-Trichloroethane

Mar 31Resolved

Vinyl chloride

Mar 31Resolved

Carbon tetrachloride

Mar 31Resolved

1,1-Dichloroethylene

Mar 31Resolved

p-Dichlorobenzene

Mar 31Resolved

DICHLOROMETHANE

Mar 31Resolved

cis-1,2-Dichloroethylene

Mar 31Resolved

Styrene

Mar 31Resolved

Ethylbenzene

Mar 31Resolved

Toluene

Mar 31Resolved

CHLOROBENZENE

Mar 31Resolved

1,1,2-Trichloroethane

Mar 31Resolved

Tetrachloroethylene

Mar 31Resolved

Tetrachloroethylene

Mar 31Resolved

1,2,4-Trichlorobenzene

Mar 31Resolved

Vinyl chloride

Mar 31Resolved

DICHLOROMETHANE

Mar 31Resolved

p-Dichlorobenzene

Mar 31Resolved

trans-1,2-Dichloroethylene

Mar 31Resolved

1,2-Dichloroethane

Mar 31Resolved

1,1,1-Trichloroethane

Mar 31Resolved

1,2-Dichloropropane

Mar 31Resolved

Carbon tetrachloride

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Nitrate

Mar 31Resolved

Revised Total Coliform Rule

Feb 28Resolved

How Does This Compare?

Pasco (99301) has 216 recorded violations, including 10 health-based. 1 remains unresolved. Consider testing your tap water independently for added peace of mind.

Recommended Water Filters

Based on the contaminants detected in your area, these filter types may help improve your water quality.

Reverse Osmosis System

Highly effective at removing heavy metals, dissolved solids, and a wide range of contaminants. Recommended for homes with lead or arsenic concerns.

Targets:Lead, Copper, Arsenic, Mercury, Cadmium

Look for:NSF/ANSI 58 certified

NSF Certified Products → EPA Safe Drinking Water Guide →

Activated Carbon Filter

Excellent for removing chlorine, chloramine, and disinfection byproducts like THMs and HAAs. Available as pitcher filters, countertop, or under-sink units.

Targets:THMs, HAAs, Chlorine, Chloramine, Taste & Odor

Look for:NSF/ANSI 42 & 53 certified

NSF Certified Products → EPA Safe Drinking Water Guide →

UV Water Purifier

Uses ultraviolet light to neutralize bacteria, viruses, and parasites without chemicals. Ideal for homes with microbial contamination concerns.

Targets:E. coli, Coliform, Giardia, Cryptosporidium

Look for:NSF/ANSI 55 (Class A) certified

NSF Certified Products → EPA Safe Drinking Water Guide →

Always look for filters certified by NSF International for the specific contaminants you want to remove.

Water Quality in Pasco, WA (99301)

What does this mean?

Violations Detail (216 total)

Lead & Copper Levels

Violation Timeline

2025(15)

2024(11)

2023(79)

2022(59)

2021(52)

How Does This Compare?

Recommended Water Filters

Reverse Osmosis System

Activated Carbon Filter

UV Water Purifier

Nearby ZIP Codes

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