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Community Water System · PWS WA5347001

Lewis Co Water Dist #2

Onalaska, Washington 98570 - drinking water served from groundwater sources to 1,983 people, tracked in EPA SDWIS and UCMR5.

1,983
People served
2,344
EPA violations
2
Health-based
Untested
UCMR5 result

The verdict

EPA records 2,344 drinking-water violations at Lewis Co Water Dist #2 - above the Washington per-system average.

2,344
Total EPA violations on record
0%
Health-based (MCL / treatment failure)
1,983
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Lewis Co Water Dist #2

Lewis Co Water Dist #2 is a local-owned community water system that delivers drinking water to 1,983 residents in Onalaska, Washington (Lewis County) through 246 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 2,344 total violations for this system , of which 2 (0%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 2,335 monitoring and reporting violations are on file. The most recent violation on record dates to 2016.

The most frequently cited contaminant at this system is Endrin, recorded in 126 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Washington, EPA tracks 4,557 public water systems serving 9,736,844 people, with 314,648 cumulative violations and 20,590 health-based violations on record. About 92% of systems in the state carry at least one violation, and state-wide the average per system is 69 violations. Statewide, 98 of 247 UCMR5-tested systems have reported PFAS detections (39.7%).

Lewis Co Water Dist #2's 2,344 violations sit above the Washington average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
1,983
Total Violations
2,344
Health-Based Violations
2
Water Source
Groundwater

System Details

System Type
Community
Owner Type
Local
Connections
246
County
Lewis
School/Daycare
No
MCL Violations
2
Monitoring Violations
2,335
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
Endrin MR 126 2008
BHC-GAMMA MR 126 2008
Methoxychlor MR 126 2008
Toxaphene MR 126 2008
Di(2-ethylhexyl) adipate MR 126 2008
Simazine MR 126 2008
Atrazine MR 126 2008
Heptachlor MR 126 2008
Heptachlor epoxide MR 126 2008
HEXACHLOROBENZENE MR 126 2008
Chlordane MR 126 2008
Hexachlorocyclopentadiene MR 126 2008
LASSO MR 126 2008
Benzo(a)pyrene MR 126 2008
Di(2-ethylhexyl) phthalate MR 94 2008
Pentachlorophenol MR 35 2008
Nitrate MR 28 2015
Lead and Copper Rule MR 21 2008
Coliform (TCR) MR 12 2010
Picloram MR 11 2005
Dinoseb MR 11 2005
2,4,5-TP MR 11 2005
Dalapon MR 11 2005
cis-1,2-Dichloroethylene MR 10 2005
DICHLOROMETHANE MR 10 2005
p-Dichlorobenzene MR 10 2005
Vinyl chloride MR 10 2005
1,2-Dichloroethane MR 10 2005
1,1,1-Trichloroethane MR 10 2005
Carbon tetrachloride MR 10 2005

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Lewis Co Water Dist #2.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID WA5347001 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Washington Drinking Water Authority

Washington State Department of Health, Office of Drinking Water is the primacy agency that licenses and inspects Lewis Co Water Dist #2 under EPA-delegated authority.

Open WA regulator portal

Source: Washington State Department of Health, Office of Drinking Water

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2016 Consumer Confidence Rule Other 6 SDWIS / WA5347001 / 7000
2016 TTHM MR 3 SDWIS / WA5347001 / 2950
2016 Total Haloacetic Acids (HAA5) MR 3 SDWIS / WA5347001 / 2456
2016 Revised Total Coliform Rule MON 1 SDWIS / WA5347001 / 8000
2015 Nitrate MR 28 SDWIS / WA5347001 / 1040
2010 Coliform (TCR) MR 12 SDWIS / WA5347001 / 3100
2008 Endrin MR 126 SDWIS / WA5347001 / 2005
2008 BHC-GAMMA MR 126 SDWIS / WA5347001 / 2010
2008 Methoxychlor MR 126 SDWIS / WA5347001 / 2015
2008 Toxaphene MR 126 SDWIS / WA5347001 / 2020
2008 Di(2-ethylhexyl) adipate MR 126 SDWIS / WA5347001 / 2035
2008 Simazine MR 126 SDWIS / WA5347001 / 2037
2008 Atrazine MR 126 SDWIS / WA5347001 / 2050
2008 Heptachlor MR 126 SDWIS / WA5347001 / 2065
2008 Heptachlor epoxide MR 126 SDWIS / WA5347001 / 2067

How Lewis Co Water Dist #2 Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Lewis Co Water Dist #2 Washington avg Federal benchmark
Total violations 2,344 69 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 2 4.5 Indicates a contaminant exceeded a federal MCL
PFAS detection None 39.7% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 1,983 2,137 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 4,557 regulated public water systems in Washington.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Lewis Co Water Dist #2 water safe to drink? ▼
Lewis Co Water Dist #2 (PWS ID: WA5347001) has 2344 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,983 people using Groundwater sources.
How many people does Lewis Co Water Dist #2 serve? ▼
Lewis Co Water Dist #2 serves 1,983 people in Onalaska, Washington. It is a Local-owned system using Groundwater water sources with 246 service connections.
What type of violations does Lewis Co Water Dist #2 have? ▼
Lewis Co Water Dist #2 has 2,344 total violations: 2 health-based violations (MCL exceedances or treatment failures), 2,335 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Lewis Co Water Dist #2 water? ▼
No PFAS testing data is available for Lewis Co Water Dist #2 under the EPA's UCMR5 monitoring program.
What water source does Lewis Co Water Dist #2 use? ▼
Lewis Co Water Dist #2 uses Groundwater as its primary water source. It is classified as a Community Water System (CWS), serving residential populations year-round.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

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

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.