Walla Walla Water Quality

Compiled by PlainEnviro · August 25, 2026

Washington

Health Violations

According to EPA SDWIS, Walla Walla, Washington is served by 15 community water systems covering about 48,915 people. The same extract lists 108 health-based violation records, most recently coded 8000 in 2023. Counts are historical EPA registry rows, not a current compliance or drinkability score.

Water Systems

48,915

Population Served

108

Health-Based Violation Records

Distinct Contaminant Codes

Drinking water in Walla Walla, Washington is delivered through 15 EPA-regulated community water systems serving an estimated 48,915 people. Each system is tracked in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which requires testing for regulated contaminants, consumer notification of violations, and publication of an annual Consumer Confidence Report.

PlainEnviro's health-based SDWIS extract shows 108 violation records across the 15 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 3 distinct EPA contaminant codes: Revised Total Coliform Rule, Long Term 2 Enhanced Surface Water Treatment Rule, Surface Water Treatment Rule. 3 TRI-reporting industrial facilities are also located within the city limits.

A past EPA health-based registry row does not describe water delivered today or current compliance status; utilities notify customers and remediate under state primacy oversight when required. For current water-quality status and treatment practices, review your local utility's most recent Consumer Confidence Report or contact the Washington drinking water program. All records above reflect federal EPA SDWIS data and are not independently verified against state databases.

Community Water Systems

System Name	Pop. Served	Source	Violations	Status
WALLA WALLA WATER DIVISION	42,959	Surface Water	105	Health
CONSOLIDATED IRRIGATION DIST 14	1,555	Groundwater	0	Clean
WALLA WALLA UNIVERSITY	1,273	Groundwater	0	Clean
VALLE LINDO HOMES	787	Groundwater	0	Clean
GREEN TANK IRR DISTRICT 11	553	Groundwater	0	Clean
PRESCOTT TOWN OF	522	Groundwater	0	Clean
HYDRO IRRIGATION DISTRICT NO 9	260	Groundwater	0	Clean
BLALOCK ORCHARD DIST 10	250	Groundwater	0	Clean
DIXIE WATER ASSOCIATION	240	Groundwater	2	Health
BLALOCK ORCHARDS DIST 12	193	Groundwater	0	Clean
SYDNEY HEIGHTS WATER ASSN	130	Groundwater	0	Clean
SUMMERS CIRCLE WATER LLC	82	Groundwater	0	Clean
KOOSKOOSKIE CABIN OWNERS INC.	45	Groundwater	0	Clean
PROSPECT HEIGHTS COMM WATER ASSN	40	Groundwater	1	Health
RESER CREEK WATER SYSTEM	26	Groundwater	0	Clean

Does this city have health-based water violations?

These health-based records can represent Maximum Contaminant Level (MCL), Treatment Technique (TT), or Maximum Residual Disinfectant Level (MRDL) categories. A historical record does not establish that water is currently unsafe.

Water system	Contaminant	Category	Begin Date	End Date	Enforcement
DIXIE WATER ASSOCIATION	Revised Total Coliform Rule	MCL	2023-07-01	2023-07-31	3016506ENF
DIXIE WATER ASSOCIATION	Revised Total Coliform Rule	MCL	2023-07-01	2023-07-31	3016506ENF
WALLA WALLA WATER DIVISION	Long Term 2 Enhanced Surface Water Treatment Rule	TT	2018-12-01	Ongoing	2360005ENF
WALLA WALLA WATER DIVISION	Long Term 2 Enhanced Surface Water Treatment Rule	TT	2018-12-01	Ongoing	2360005ENF
WALLA WALLA WATER DIVISION	Long Term 2 Enhanced Surface Water Treatment Rule	TT	2018-11-01	Ongoing	2360005ENF
WALLA WALLA WATER DIVISION	Long Term 2 Enhanced Surface Water Treatment Rule	TT	2018-11-01	Ongoing	2360005ENF
WALLA WALLA WATER DIVISION	Long Term 2 Enhanced Surface Water Treatment Rule	TT	2018-10-01	Ongoing	2360005ENF
WALLA WALLA WATER DIVISION	Long Term 2 Enhanced Surface Water Treatment Rule	TT	2018-10-01	Ongoing	2360005ENF
WALLA WALLA WATER DIVISION	Long Term 2 Enhanced Surface Water Treatment Rule	TT	2018-09-01	Ongoing	2360005ENF
WALLA WALLA WATER DIVISION	Long Term 2 Enhanced Surface Water Treatment Rule	TT	2018-09-01	Ongoing	2360005ENF
WALLA WALLA WATER DIVISION	Long Term 2 Enhanced Surface Water Treatment Rule	TT	2018-08-01	Ongoing	2360005ENF
WALLA WALLA WATER DIVISION	Long Term 2 Enhanced Surface Water Treatment Rule	TT	2018-08-01	Ongoing	2360005ENF
WALLA WALLA WATER DIVISION	Long Term 2 Enhanced Surface Water Treatment Rule	TT	2018-07-01	Ongoing	2360005ENF
WALLA WALLA WATER DIVISION	Long Term 2 Enhanced Surface Water Treatment Rule	TT	2018-07-01	Ongoing	2360005ENF
WALLA WALLA WATER DIVISION	Long Term 2 Enhanced Surface Water Treatment Rule	TT	2018-06-01	Ongoing	2360005ENF
WALLA WALLA WATER DIVISION	Long Term 2 Enhanced Surface Water Treatment Rule	TT	2018-06-01	Ongoing	2360005ENF
WALLA WALLA WATER DIVISION	Long Term 2 Enhanced Surface Water Treatment Rule	TT	2018-05-01	Ongoing	2360005ENF
WALLA WALLA WATER DIVISION	Long Term 2 Enhanced Surface Water Treatment Rule	TT	2018-05-01	Ongoing	2360005ENF
WALLA WALLA WATER DIVISION	Long Term 2 Enhanced Surface Water Treatment Rule	TT	2018-04-01	Ongoing	2360005ENF
WALLA WALLA WATER DIVISION	Long Term 2 Enhanced Surface Water Treatment Rule	TT	2018-04-01	Ongoing	2360005ENF
WALLA WALLA WATER DIVISION	Long Term 2 Enhanced Surface Water Treatment Rule	TT	2018-03-01	Ongoing	2360005ENF
WALLA WALLA WATER DIVISION	Long Term 2 Enhanced Surface Water Treatment Rule	TT	2018-03-01	Ongoing	2360005ENF
WALLA WALLA WATER DIVISION	Long Term 2 Enhanced Surface Water Treatment Rule	TT	2018-02-01	Ongoing	2360005ENF
WALLA WALLA WATER DIVISION	Long Term 2 Enhanced Surface Water Treatment Rule	TT	2018-02-01	Ongoing	2360005ENF
WALLA WALLA WATER DIVISION	Long Term 2 Enhanced Surface Water Treatment Rule	TT	2018-01-01	Ongoing	2360005ENF
WALLA WALLA WATER DIVISION	Long Term 2 Enhanced Surface Water Treatment Rule	TT	2018-01-01	Ongoing	2360005ENF
WALLA WALLA WATER DIVISION	Surface Water Treatment Rule	TT	2017-12-01	Ongoing	2251167ENF
WALLA WALLA WATER DIVISION	Surface Water Treatment Rule	TT	2017-12-01	2017-12-31	2251167ENF
WALLA WALLA WATER DIVISION	Surface Water Treatment Rule	TT	2017-12-01	2017-12-31	2251167ENF
PROSPECT HEIGHTS COMM WATER ASSN	Revised Total Coliform Rule	MCL	2017-12-01	2017-12-31	2231342ENF
WALLA WALLA WATER DIVISION	Surface Water Treatment Rule	TT	2017-11-01	Ongoing	2251167ENF
WALLA WALLA WATER DIVISION	Surface Water Treatment Rule	TT	2017-11-01	2017-11-30	2251167ENF
WALLA WALLA WATER DIVISION	Surface Water Treatment Rule	TT	2017-11-01	2017-11-30	2251167ENF
WALLA WALLA WATER DIVISION	Surface Water Treatment Rule	TT	2017-10-01	Ongoing	2251167ENF
WALLA WALLA WATER DIVISION	Surface Water Treatment Rule	TT	2017-10-01	2017-10-31	2251167ENF
WALLA WALLA WATER DIVISION	Surface Water Treatment Rule	TT	2017-10-01	2017-10-31	2251167ENF
WALLA WALLA WATER DIVISION	Surface Water Treatment Rule	TT	2017-09-01	Ongoing	2251167ENF
WALLA WALLA WATER DIVISION	Surface Water Treatment Rule	TT	2017-09-01	2017-09-30	2251167ENF
WALLA WALLA WATER DIVISION	Surface Water Treatment Rule	TT	2017-09-01	2017-09-30	2251167ENF
WALLA WALLA WATER DIVISION	Surface Water Treatment Rule	TT	2017-08-01	Ongoing	2251167ENF
WALLA WALLA WATER DIVISION	Surface Water Treatment Rule	TT	2017-08-01	2017-08-31	2251167ENF
WALLA WALLA WATER DIVISION	Surface Water Treatment Rule	TT	2017-08-01	2017-08-31	2251167ENF
WALLA WALLA WATER DIVISION	Surface Water Treatment Rule	TT	2017-07-01	Ongoing	2251167ENF
WALLA WALLA WATER DIVISION	Surface Water Treatment Rule	TT	2017-07-01	2017-07-31	2251167ENF
WALLA WALLA WATER DIVISION	Surface Water Treatment Rule	TT	2017-07-01	2017-07-31	2251167ENF
WALLA WALLA WATER DIVISION	Surface Water Treatment Rule	TT	2017-06-01	Ongoing	2251167ENF
WALLA WALLA WATER DIVISION	Surface Water Treatment Rule	TT	2017-06-01	2017-06-30	2251167ENF
WALLA WALLA WATER DIVISION	Surface Water Treatment Rule	TT	2017-06-01	2017-06-30	2251167ENF
WALLA WALLA WATER DIVISION	Surface Water Treatment Rule	TT	2017-05-01	Ongoing	2251167ENF
WALLA WALLA WATER DIVISION	Surface Water Treatment Rule	TT	2017-05-01	2017-05-31	2251167ENF

What are Walla Walla's health-based records for?

Walla Walla's health-based violation records carry 3 distinct EPA codes: some name a substance, others the drinking-water rule that was breached. Counts are records on file in the EPA SDWIS extract, not current test results.

Contaminant	Records	Systems	Most recent
Surface Water Treatment Rule	81	1	2017-12-01
Long Term 2 Enhanced Surface Water Treatment Rule	24	1	2018-12-01
Revised Total Coliform Rule	3	2	2023-07-01

TRI Facilities in Walla Walla

Facility	Industry	Total Releases	Chemicals
Walla Walla Foundry Inc.	Primary Metals	4.7K lbs	1
Nelson Irrigation Corp	Fabricated Metals	750 lbs	1
Key Technology Inc	Machinery	0 lbs	3

Frequently Asked Questions

What does EPA SDWIS list for drinking water in Walla Walla, Washington? ▼

Walla Walla is listed with 15 EPA-regulated water systems covering approximately 48,915 people. 108 health-based violation records appear in the extract. A past registry row is not a current drinkability verdict; contact the local utility for current status.

How many water violations does Walla Walla have in this EPA extract? ▼

Walla Walla water systems have 108 health-based violation records in PlainEnviro's EPA SDWIS extract. This extract is filtered to EPA health-based records and does not include monitoring or reporting violations.

What contaminants were found in Walla Walla water? ▼

Health-based records for Walla Walla water systems carry the following EPA contaminant codes: Revised Total Coliform Rule, Long Term 2 Enhanced Surface Water Treatment Rule, Surface Water Treatment Rule. This source edition does not include authoritative contaminant names. Source: EPA SDWIS.

How many water systems serve Walla Walla? ▼

15 EPA-regulated community water systems serve Walla Walla, Washington, collectively covering approximately 48,915 people. Data is from the EPA Safe Drinking Water Information System (SDWIS).

Where does Walla Walla get its drinking water? ▼

Walla Walla's water supply comes from 15 EPA-regulated community water systems. Source type data is not available for all systems. For detailed supply information, contact your local water utility. Source: EPA SDWIS.

Are there pollution sources near Walla Walla? ▼

Yes, 3 EPA Toxic Release Inventory (TRI) facilities are registered in Walla Walla, Washington, reporting a combined 5.5K lbs of toxic chemical releases. TRI data reflects self-reported emissions; it does not measure exposure or health effects. Source: EPA TRI.

How does Walla Walla compare in Washington?

Of the 365 Washington places with at least one community water system on file, Walla Walla ranks #35 by number of systems (15).

Either side of it: Seattle (16), Raymond (15), Kennewick (14), Cashmere (13)

About This Data

Figures here are the current EPA SDWIS extract joined to the 15 community water systems whose service area lists Walla Walla, ranked against the 365 Washington places with at least one system on file. Data current as of 2026-08-25.

Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). PlainEnviro's violation fetch is restricted upstream to records EPA flags as health-based and then joined to active community water systems. Monitoring and reporting violations are not included.

A health-based violation row in this extract is a historical EPA registry entry. It does not describe water delivered today or current compliance status. Many records are later resolved, and public water systems notify customers when required. For current conditions, contact your local water utility or the state drinking water program.

TRI facility data comes from the EPA Toxic Release Inventory. Facilities shown are those that self-report to the TRI program. PlainEnviro presents this data without advocacy framing.

Read our methodology - how this data is sourced, computed, and verified.

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Data sourced from U.S. EPA environmental datasets. See our methodology for details. Retrieved and formatted by PlainEnviro