Water Quality in TOPPENISH, WA (98948)

EPA violation data for public water systems serving ZIP code 98948.

156

Total Violations

Health-Based

Monitoring / Reporting

126

Resolved

What does this mean?

126 of 156 violations have been resolved. 57 are health-based violations, meaning contaminant levels exceeded federal safety limits. The remaining 99 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: 56 Population served: 24,120

Violations Detail (156 total)

Contaminant	Category	MCL Limit	Measured	Date	Status	Health Effects
TTHM	Monitoring	N/A	N/A	Jun 30, 2025	Resolved	N/A
Total Haloacetic Acids (HAA5)	Monitoring	N/A	N/A	Jun 30, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2025	Resolved	N/A
Chlorine	Monitoring	N/A	N/A	Jun 30, 2025	Resolved	Eye and nose irritation; stomach discomfort
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2025	Resolved	N/A
Chlorine	Monitoring	N/A	N/A	Jun 30, 2025	Resolved	Eye and nose irritation; stomach discomfort
Chlorine	Monitoring	N/A	N/A	Jun 30, 2025	Resolved	Eye and nose irritation; stomach discomfort
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2025	Resolved	N/A
Nitrate	Monitoring	N/A	N/A	Jun 30, 2025	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Chlorine	Monitoring	N/A	N/A	Jun 30, 2025	Resolved	Eye and nose irritation; stomach discomfort
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2025	Resolved	N/A
Chlorine	Monitoring	N/A	N/A	Jun 30, 2025	Resolved	Eye and nose irritation; stomach discomfort
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jun 30, 2025	Active	N/A
Chlorine	Monitoring	N/A	N/A	Apr 30, 2025	Resolved	Eye and nose irritation; stomach discomfort
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
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2025	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Mar 31, 2025	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Dec 12, 2024	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Dec 12, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Oct 31, 2024	Resolved	N/A
Chlorine	Monitoring	N/A	N/A	Oct 31, 2024	Resolved	Eye and nose irritation; stomach discomfort
Revised Total Coliform Rule	Monitoring	N/A	N/A	Oct 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Oct 31, 2024	Resolved	N/A
LEAD AND COPPER RULE REVISIONS	Monitoring	N/A	N/A	Oct 16, 2024	Active	N/A
LEAD AND COPPER RULE REVISIONS	Health-Based	N/A	N/A	Oct 16, 2024	Active	N/A
LEAD AND COPPER RULE REVISIONS	Monitoring	N/A	N/A	Oct 16, 2024	Resolved	N/A
LEAD AND COPPER RULE REVISIONS	Health-Based	N/A	N/A	Oct 16, 2024	Resolved	N/A
Chlorine	Monitoring	N/A	N/A	Aug 31, 2024	Resolved	Eye and nose irritation; stomach discomfort
Revised Total Coliform Rule	Monitoring	N/A	N/A	Aug 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jul 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jul 31, 2024	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jul 31, 2024	Resolved	N/A
Chlorine	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	Eye and nose irritation; stomach discomfort
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
TTHM	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Total Haloacetic Acids (HAA5)	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Revised Total Coliform Rule	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
Revised Total Coliform Rule	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	N/A
Chlorine	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	Eye and nose irritation; stomach discomfort
Chlorine	Monitoring	N/A	N/A	Dec 31, 2023	Resolved	Eye and nose irritation; stomach discomfort
Lead and Copper Rule	Monitoring	N/A	N/A	Dec 29, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Nov 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Nov 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Nov 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Nov 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Nov 30, 2023	Resolved	N/A
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	Oct 31, 2023	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Oct 30, 2023	Resolved	N/A
Chlorine	Monitoring	N/A	N/A	Sep 30, 2023	Resolved	Eye and nose irritation; stomach discomfort
Chlorine	Monitoring	N/A	N/A	Sep 30, 2023	Resolved	Eye and nose irritation; stomach discomfort
Revised Total Coliform Rule	Monitoring	N/A	N/A	Sep 30, 2023	Resolved	N/A
Nitrate	Monitoring	N/A	N/A	Sep 30, 2023	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Chlorine	Monitoring	N/A	N/A	Sep 30, 2023	Resolved	Eye and nose irritation; stomach discomfort
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jul 31, 2023	Resolved	N/A
Nitrate	Monitoring	N/A	N/A	Jun 30, 2023	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, 2023	Resolved	N/A
Arsenic	Monitoring	N/A	N/A	Jun 30, 2023	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	May 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jan 31, 2023	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Jan 10, 2023	Resolved	N/A
Nitrate	Monitoring	N/A	N/A	Dec 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	Dec 31, 2022	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 29, 2022	Resolved	N/A
Nitrate	Monitoring	N/A	N/A	Sep 30, 2022	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	Jul 30, 2022	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Jun 30, 2022	Resolved	N/A
Public Notice	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
Public Notice	Monitoring	N/A	N/A	Jun 10, 2022	Resolved	N/A
Public Notice	Monitoring	N/A	N/A	Jun 10, 2022	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	May 17, 2022	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	May 17, 2022	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	May 17, 2022	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	May 17, 2022	Resolved	N/A
2,4-D	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
2,4,5-TP	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Picloram	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Dalapon	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Toxaphene	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Total Polychlorinated Biphenyls (PCB)	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Pentachlorophenol	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Dinoseb	Monitoring	N/A	N/A	Mar 31, 2022	Resolved	N/A
Chlordane	Monitoring	N/A	N/A	Mar 31, 2022	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
OXAMYL	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
2,3,7,8-TCDD	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Carbofuran	Monitoring	N/A	N/A	Dec 31, 2021	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Oct 30, 2021	Resolved	N/A
Lead and Copper Rule	Monitoring	N/A	N/A	Oct 30, 2021	Resolved	N/A
Nitrate	Monitoring	N/A	N/A	Sep 30, 2021	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Resolved	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Active	N/A
Groundwater Rule	Health-Based	N/A	N/A	Jul 9, 2021	Active	N/A
Arsenic	Health-Based	N/A	0.011	Jun 30, 2021	Resolved	Skin damage; circulatory system problems; increased risk of cancer
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Revised Total Coliform Rule	Monitoring	N/A	N/A	Apr 30, 2021	Resolved	N/A
Nitrate	Monitoring	N/A	N/A	Mar 31, 2021	Resolved	Infants below the age of six months could become seriously ill (blue baby syndrome); shortness of breath
Arsenic	Health-Based	N/A	0.012	Mar 31, 2021	Resolved	Skin damage; circulatory system problems; increased risk of cancer

Lead & Copper Levels

Violation Timeline

2025(18)

TTHM

Jun 30Resolved

Total Haloacetic Acids (HAA5)

Jun 30Resolved

Revised Total Coliform Rule

Jun 30Resolved

Chlorine

Jun 30Resolved

Revised Total Coliform Rule

Jun 30Resolved

Chlorine

Jun 30Resolved

Chlorine

Jun 30Resolved

Revised Total Coliform Rule

Jun 30Resolved

Nitrate

Jun 30Resolved

Chlorine

Jun 30Resolved

Revised Total Coliform Rule

Jun 30Resolved

Chlorine

Jun 30Resolved

Revised Total Coliform Rule

Jun 30Active

Chlorine

Apr 30Resolved

Revised Total Coliform Rule

Apr 30Resolved

Revised Total Coliform Rule

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

Revised Total Coliform Rule

Mar 31Resolved

2024(15)

Public Notice

Dec 12Resolved

Public Notice

Dec 12Resolved

Revised Total Coliform Rule

Oct 31Resolved

Chlorine

Oct 31Resolved

Revised Total Coliform Rule

Oct 31Resolved

Revised Total Coliform Rule

Oct 31Resolved

LEAD AND COPPER RULE REVISIONS

Oct 16Active

LEAD AND COPPER RULE REVISIONS

Oct 16Active

LEAD AND COPPER RULE REVISIONS

Oct 16Resolved

LEAD AND COPPER RULE REVISIONS

Oct 16Resolved

Chlorine

Aug 31Resolved

Revised Total Coliform Rule

Aug 31Resolved

Revised Total Coliform Rule

Jul 31Resolved

Revised Total Coliform Rule

Jul 31Resolved

Revised Total Coliform Rule

Jul 31Resolved

2021(66)

Nitrate

Dec 31Resolved

Nitrate

Dec 31Resolved

OXAMYL

Dec 31Resolved

2,3,7,8-TCDD

Dec 31Resolved

Carbofuran

Dec 31Resolved

Lead and Copper Rule

Oct 30Resolved

Lead and Copper Rule

Oct 30Resolved

Nitrate

Sep 30Resolved

Groundwater Rule

Jul 9Resolved

Groundwater Rule

Jul 9Active

Groundwater Rule

Jul 9Resolved

Groundwater Rule

Jul 9Resolved

Groundwater Rule

Jul 9Resolved

Groundwater Rule

Jul 9Resolved

Groundwater Rule

Jul 9Resolved

Groundwater Rule

Jul 9Resolved

Groundwater Rule

Jul 9Active

Groundwater Rule

Jul 9Active

Groundwater Rule

Jul 9Active

Groundwater Rule

Jul 9Resolved

Groundwater Rule

Jul 9Active

Groundwater Rule

Jul 9Resolved

Groundwater Rule

Jul 9Active

Groundwater Rule

Jul 9Active

Groundwater Rule

Jul 9Active

Groundwater Rule

Jul 9Resolved

Groundwater Rule

Jul 9Resolved

Groundwater Rule

Jul 9Resolved

Groundwater Rule

Jul 9Resolved

Groundwater Rule

Jul 9Resolved

Groundwater Rule

Jul 9Resolved

Groundwater Rule

Jul 9Resolved

Groundwater Rule

Jul 9Resolved

Groundwater Rule

Jul 9Resolved

Groundwater Rule

Jul 9Resolved

Groundwater Rule

Jul 9Resolved

Groundwater Rule

Jul 9Active

Groundwater Rule

Jul 9Active

Groundwater Rule

Jul 9Active

Groundwater Rule

Jul 9Active

Groundwater Rule

Jul 9Active

Groundwater Rule

Jul 9Active

Groundwater Rule

Jul 9Active

Groundwater Rule

Jul 9Active

Groundwater Rule

Jul 9Active

Groundwater Rule

Jul 9Resolved

Groundwater Rule

Jul 9Active

Groundwater Rule

Jul 9Resolved

Groundwater Rule

Jul 9Active

Groundwater Rule

Jul 9Active

Groundwater Rule

Jul 9Active

Groundwater Rule

Jul 9Active

Groundwater Rule

Jul 9Active

Groundwater Rule

Jul 9Active

Groundwater Rule

Jul 9Active

Groundwater Rule

Jul 9Active

Groundwater Rule

Jul 9Active

Arsenic

Jun 30Resolved

Revised Total Coliform Rule

Apr 30Resolved

Revised Total Coliform Rule

Apr 30Resolved

Revised Total Coliform Rule

Apr 30Resolved

Revised Total Coliform Rule

Apr 30Resolved

Revised Total Coliform Rule

Apr 30Resolved

Revised Total Coliform Rule

Apr 30Resolved

Nitrate

Mar 31Resolved

Arsenic

Mar 31Resolved

How Does This Compare?

TOPPENISH (98948) has 156 recorded violations, including 57 health-based. 30 remain 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 TOPPENISH, WA (98948)

What does this mean?

Violations Detail (156 total)

Lead & Copper Levels

Violation Timeline

2025(18)

2024(15)

2023(34)

2022(23)

2021(66)

How Does This Compare?

Recommended Water Filters

Reverse Osmosis System

Activated Carbon Filter

UV Water Purifier

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