County · Washington

Cowlitz County, Washington: drinking water records

Name: Drinking water records for Cowlitz County, Washington
Creator: U.S. Environmental Protection Agency
License: https://www.usa.gov/government-works

Explore EPA records for 31 community water systems across 10 ZIP codes in Cowlitz County, then find water-testing resources and available recent monitoring-station readings.

In focus31Community water systems

Public records. Clearer context.

Data as of EPA UCMR 5 final release, August 2026 (file dated Aug 28, 2026) · EPA SDWIS 2026Q2 (file dated Jul 9, 2026). How we build these pages

Drinking-water records

EPA survey and compliance records are historical reports. UCMR 5 results are available for 6 of the 31 listed systems in this snapshot. A system with no reported PFAS detection is not a test of every tap or every contaminant.

systems in EPA's PFAS survey

systems where PFAS was found

systems at or above the PFOA or PFOS limit, on the yearly-average basis EPA uses

systems that have reached the lead action level

systems with a health-based violation since 2016

System population figures are summed from EPA registry records and can overlap where wholesalers and retail systems serve the same people. They are not a Census county-population estimate.

Water systems in this county

All 31 active community systems in the available county records, sorted by record completeness. Scroll the table to explore more systems.

Water system	People served	PFAS survey results	PFAS found	Health-based violations	Lead, 9 in 10 homes at or below
Longview Water Department WA5348100	57,617	60	0	0	0 ppbbelow the action level
Kelso City of WA5338000	15,775	120	0	0	1 ppbbelow the action level
Beacon Hill Water & Sewer District WA5315650	11,969	60	0	0	0 ppbbelow the action level
Woodland City of WA5398200	10,640	120	1	0	2.1 ppbbelow the action level
Kalama City of WA5337550	8,020	120	0	0	1 ppbbelow the action level
Castle Rock Municipal Water WA5311800	4,367	360	0	0	5 ppbbelow the action level
Carrolls Water Assn WA5311300	449	0	0	3	1.3 ppbbelow the action level
Kelley Crest WA5329441	45	0	0	1	4 ppbbelow the action level
Hazel Dell Mobile Park WA5331975	24	0	0	1	16.5 ppbat or above the action level
Toutle Community Regional Water WA5388905	3,215	0	0	0	2 ppbbelow the action level
Ryderwood Improvement & Service As WA5375100	434	0	0	0	0.5 ppbbelow the action level
Lewis River RV Park WA5329521	347	0	0	0	2.7 ppbbelow the action level
Lewis River Golf Course WA5337105	300	0	0	0	2.1 ppbbelow the action level
Cougar Crest WA5315130	290	0	0	0	1.6 ppbbelow the action level
Peterson Farms WA5301484	290	0	0	0	0 ppbbelow the action level
Columbia Riverfront RV Park WA5300946	233	0	0	0	10.6 ppbbelow the action level
Davis Terrace Water Assn WA5318150	222	0	0	0	0 ppbbelow the action level
Beacon Hill East WA53AD882	190	0	0	0	1 ppbbelow the action level
Camelot Subdivision WA5310805	142	0	0	0	1.5 ppbbelow the action level
Sandwood Heights Subdivision WA5375893	126	0	0	0	3.8 ppbbelow the action level
Owl Creek WA5303943	102	0	0	0	1.1 ppbbelow the action level
Mulkey Meadows 1 WA5302519	93	0	0	0	0 ppbbelow the action level
Merwin Village/Park Ppl Co WA5354061	92	0	0	0	0 ppbbelow the action level
High Ridge WA53AB327	73	0	0	0	0 ppbbelow the action level
Edgewater Mobile Estates WA5322421	70	0	0	0	0.6 ppbbelow the action level
Paradise Cove Resort & RV Park WA5313533	59	0	0	0	1.8 ppbbelow the action level
Columbia Crest Estates WA5307200	48	0	0	0	0 ppbbelow the action level
Toutle River View WA5388920	45	0	0	0	1 ppbbelow the action level
Tulip Meadows WA53AD861	33	0	0	0	0 ppbbelow the action level
Pleasant Hill Terrace Subdivision WA5367865	30	0	0	0	1.7 ppbbelow the action level
Viking Village Mobile Home Park WA5391908	25	0	0	0	3.2 ppbbelow the action level

Shaded rows report lead at or above the 15 ppb action level in their latest monitoring period. EPA sets that level for the value 9 in 10 sampled homes fall at or below; reaching it requires the utility to act, and it is not a measurement of any single tap. One system in this table is at or above it. What an action level means

USGS · Monitoring stations

The water, more recently.

Available station readings in Cowlitz County, Washington. Each measurement keeps its time, unit and original source.

These readings describe water at a monitoring station. They do not test your tap, measure PFAS or lead, or determine whether water is safe to drink or swim in.

Recent observations load when this section comes into view.

How these readings update

We check for updates every 10 minutes while this section is visible and show supported observations from the last 48 hours. The time beside a reading is when USGS measured it; the checked time is when our service retrieved the response. We mark a reading more than 6 hours old as older. Provisional observations can change after USGS review. A missing reading does not mean zero or clean water.

Temperature, pH, dissolved oxygen, turbidity, conductivity, streamflow and water level are shown only where a station reports them. Different measurements have different units and sampling intervals. USGS data and documentation.

Your next step

Water testing, reports & local help.

Use these official directories to find your drinking-water agency, a certified laboratory and public water records. We have not yet added an individually reviewed local resource list for this county.

Official national directories

Water testing

Find your state’s private-well program

EPA’s state directory points well owners to local program information. Services and eligibility vary by state and county.

U.S. Environmental Protection Agency
Source reviewed 2026-09-15 · Source updated 2026-08-05

Water testing

Find a certified drinking-water laboratory

Use EPA’s directory to reach your state’s laboratory certification program. EPA does not provide on-request testing of residential drinking water.

U.S. Environmental Protection Agency
Source reviewed 2026-09-15 · Source updated 2026-08-11

Public records

Find your utility’s Consumer Confidence Report

EPA links to community water-system reports and explains how to read them. Look for your actual supplier rather than assuming every address in a county shares one system.

U.S. Environmental Protection Agency
Source reviewed 2026-09-15 · Source updated 2026-09-09

Public records

Explore USGS water observations

Find current and historical observations from USGS monitoring locations, including available stream, lake, and groundwater data. Measurements vary by station and do not replace a test of your household water.

U.S. Geological Survey
Source reviewed 2026-09-15

A county overview cannot identify every property’s water provider. If you use a public water system, confirm its name on your bill and request its annual Consumer Confidence Report. Private wells need their own testing; public-system records do not describe a private well.

Understand water testing and laboratory reports

Resource descriptions are compiled by Tap Water Lookup. Review dates describe our source check, not a new water sample. How we review sources · Suggest a correction

Explore your area

Local coverage in Cowlitz County

10ZIP areas in this overview

Explore the water-system records, recent station readings and testing resources on this county page. They describe the systems and stations identified in each section; they are not a separate water test for every community.

Towns and communities

Castle Rock
Kalama
Kelso
Longview
Ryderwood
Woodland

Explore water-system records Find water-testing resources

View ZIP areas and understand coverage

98581Ryderwood
98603
98609
98611Castle Rock
98625Kalama
98626Kelso
98632Longview
98645
98649
98674Woodland

These Census ZIP Code Tabulation Areas are grouped here by their largest county overlap. A ZIP area can cross county lines and contain several water suppliers or private wells. Place labels reflect Census geography, not verified postal city names or utility service boundaries.

Records for these areas are currently presented in this county overview rather than individual ZIP reports. An unpublished report does not mean there are no water records. Confirm your supplier on your water bill; if you use a private well, testing your own well is the relevant next step.

Beyond this county page

Keep reading. Compare nearby.

PFASChoosing a PFAS filterPFAS was found in 1 of the 6 systems EPA surveyed here. See how to check a filter’s certified PFAS reduction.LeadChoosing a lead filter11 systems here have reached the lead action level. See how to check a filter’s lead-reduction certification.Your utilityFind your annual water reportConfirm the supplier on your bill, then read its Consumer Confidence Report for local results.

Counties near Cowlitz County

All Washington counties

Sources and scope

EPA UCMR 5 occurrence data, samples collected 2023-01-03 – 2026-06-17, final release, August 2026 (file dated Aug 28, 2026); EPA SDWIS via ECHO, 2026Q2 extract (file dated Jul 9, 2026); EPA service-area boundaries v3.0; Census 2020 ZCTAs. Database prepared 2026-09-03.

Counts cover the systems that report this county to EPA. A water system may cross county lines. "Found" means at least one result at or above the laboratory reporting level; it is not a compliance finding.

Compiled by Tap Water Lookup from the sources identified on this page. Read the methodology and review process.