County · Washington
Mason County, Washington: drinking water records
Explore EPA records for 123 community water systems across 9 ZIP codes in Mason County, then find water-testing resources and available recent monitoring-station readings.
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 5 of the 123 listed systems in this snapshot. A system with no reported PFAS detection is not a test of every tap or every contaminant.
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 123 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 |
|---|---|---|---|---|---|
| Shelton City of WA5378170 | 15,089 | 180 | 0 | 0 | 1.8 ppbbelow the action level |
| Lake Cushman System 5 WA5303529 | 3,675 | 420 | 2 | 0 | 2 ppbbelow the action level |
| Squaxin Consolidated 105300146 | 1,500 | 0 | 0 | 4 | 8.1 ppbbelow the action level |
| Shoalwater Bay 105300019 | 898 | 60 | 0 | 0 | 2.9 ppbbelow the action level |
| Hartstene Pointe WA5331569 | 460 | 0 | 0 | 4 | 8.5 ppbbelow the action level |
| Emerald Lake WA5323294 | 331 | 60 | 0 | 0 | 0 ppbbelow the action level |
| Lakewood Heights WA5317999 | 170 | 0 | 0 | 1 | 1 ppbbelow the action level |
| Shadowood WA5313584 | 154 | 0 | 0 | 2 | 4.5 ppbbelow the action level |
| Bayshore WA5304900 | 130 | 60 | 0 | 0 | 4.5 ppbbelow the action level |
| Three Fingers WA5361129 | 78 | 0 | 0 | 1 | 0 ppbbelow the action level |
| Olympic Trails Water Supply WA5363448 | 44 | 0 | 0 | 2 | 22.5 ppbat or above the action level |
| Smith Cove WA5313651 | 30 | 0 | 0 | 1 | 0.7 ppbbelow the action level |
| Belfair Water District 1 WA5305350 | 4,432 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Timberlake Community Club INC WA5388370 | 2,337 | 0 | 0 | 0 | 5 ppbbelow the action level |
| Washington Corrections Center WA5393063 | 2,223 | 0 | 0 | 0 | 1.6 ppbbelow the action level |
| Alderbrook Water Co WA5301050 | 2,154 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Lake Limerick Water WA5344150 | 2,148 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Lakeland Village Water WA5345090 | 2,120 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Hoodsport WA5334100 | 1,853 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Shorecrest Estates Water Co WA5378620 | 1,321 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Skokomish 105300020 | 1,150 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Beards Cove WA5305100 | 1,100 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Fawn Lake Maintenance Comm WA5324713 | 1,044 | 0 | 0 | 0 | 5 ppbbelow the action level |
| Lake Cushman System 3 WA5303528 | 917 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Lynch Cove WA5349100 | 721 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Union WA5351920 | 700 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Oak Park WA5362675 | 695 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Twanoh Falls Beach Club WA5310751 | 481 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Allyn Shopping Center WA5301695 | 414 | 0 | 0 | 0 | 0.5 ppbbelow the action level |
| Paradise Estates WA5366125 | 403 | 0 | 0 | 0 | 9.1 ppbbelow the action level |
| Port of Allyn WA5368790 | 397 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Hood Canal WA5334050 | 368 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Tahuya River Valley Water District WA5387115 | 367 | 0 | 0 | 0 | 2.3 ppbbelow the action level |
| Hiapark WA5303224 | 360 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Lake Arrowhead WA5343600 | 343 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Collins Lake Community Club WA5314057 | 322 | 0 | 0 | 0 | 0.9 ppbbelow the action level |
| Rustlewood WA5375027 | 322 | 0 | 0 | 0 | 1.5 ppbbelow the action level |
| Treasure Island Country Club WA5389150 | 321 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Colony Surf Water Supply WA5314080 | 297 | 0 | 0 | 0 | 0.8 ppbbelow the action level |
| Maggie Lake Water District WA5350235 | 287 | 0 | 0 | 0 | 1 ppbbelow the action level |
| View Ridge Heights WA5391845 | 271 | 0 | 0 | 0 | 2.5 ppbbelow the action level |
| Island Lake Manor WA5336180 | 233 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Sunset Beach WA5386040 | 228 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Riverhill Homeowners Assn WA5372810 | 215 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Trails End Water District WA5389055 | 211 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Star Lake Community Club WA5383680 | 201 | 0 | 0 | 0 | 1.4 ppbbelow the action level |
| Woodland Manor WA5398184 | 192 | 0 | 0 | 0 | 10 ppbbelow the action level |
| Vuecrest WA5318637 | 191 | 0 | 0 | 0 | 3.5 ppbbelow the action level |
| Parkshore Estates WA5366146 | 183 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Highland Park WA5332820 | 180 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Triton Head Assn WA5389450 | 176 | 0 | 0 | 0 | 9.5 ppbbelow the action level |
| Pirates Cove Country Club WA5367740 | 168 | 0 | 0 | 0 | 0.5 ppbbelow the action level |
| Rainbow Lake WA5370791 | 168 | 0 | 0 | 0 | 5 ppbbelow the action level |
| Canal Mutual Water WA5310999 | 167 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Bellwood a WA5305534 | 163 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Beacon Point Community Club WA5305025 | 158 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Cedar Grove WA5311914 | 156 | 0 | 0 | 0 | 4.5 ppbbelow the action level |
| Mission Creek Tracts WA5355320 | 150 | 0 | 0 | 0 | 2.5 ppbbelow the action level |
| Hidden Haven Mobile Home Park WA5332660 | 149 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Dayton Trails WA5302715 | 148 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Shorebrook Community Club WA5378600 | 148 | 0 | 0 | 0 | 7 ppbbelow the action level |
| Evergreen Mobile Homeowners Co-Op WA5324154 | 140 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Holiday Beach Water Supply WA5333669 | 130 | 0 | 0 | 0 | 2.5 ppbbelow the action level |
| Ayock Beach Improvement WA5303450 | 129 | 0 | 0 | 0 | 2.9 ppbbelow the action level |
| Twanoh Heights Community Club WA5300153 | 118 | 0 | 0 | 0 | 0 ppbbelow the action level |
| River Haven WA5372811 | 113 | 0 | 0 | 0 | 2.9 ppbbelow the action level |
| Cherry Park WA5312560 | 111 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Arcadia Estates WA5302857 | 110 | 0 | 0 | 0 | 2.5 ppbbelow the action level |
| Highland Estates WA5332735 | 110 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Potlatch Beach Mutual WA5369050 | 109 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Lynch Cove Div 1 Water Assn WA5307079 | 102 | 0 | 0 | 0 | 1.9 ppbbelow the action level |
| Shore Hill WA5378650 | 101 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Bar B Estate Manor WA5322751 | 96 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Bay East WA5304852 | 96 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Mason County Lost Lake WA5348300 | 96 | 0 | 0 | 0 | 5.2 ppbbelow the action level |
| Cedar View Tracts Comm Club WA5306151 | 90 | 0 | 0 | 0 | 4.3 ppbbelow the action level |
| Springwood WA5383408 | 90 | 0 | 0 | 0 | 0.5 ppbbelow the action level |
| Harstene Retreat WA5331572 | 88 | 0 | 0 | 0 | 5 ppbbelow the action level |
| Minerva Terrace WA5355070 | 85 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Wonderland Water Company WA5398128 | 82 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Minerva Beach Resort WA5355060 | 80 | 0 | 0 | 0 | 1.8 ppbbelow the action level |
| Twanoh Terrace Water Co WA5360190 | 75 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Madrona Park WA5305793 | 73 | 0 | 0 | 0 | 0.1 ppbbelow the action level |
| Rae Lake WA5370755 | 73 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Rhododendron Place WA5301213 | 70 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Tiger Lake Terrace Tracts WA5304237 | 70 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Clifton Beach Tracts Co Op WA5313800 | 65 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Jesfield Tracts Community Club WA5336740 | 65 | 0 | 0 | 0 | 0.7 ppbbelow the action level |
| Orchard Beach Community WA5364031 | 64 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Pebble Beach WA5366700 | 64 | 0 | 0 | 0 | 0.8 ppbbelow the action level |
| Hamma Ridge WA5305867 | 63 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Curries Landing WA5303463 | 61 | 0 | 0 | 0 | 0 ppbbelow the action level |
| New Pine Acres WA53AC152 | 60 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Peninsula Pines Park WA5306794 | 60 | 0 | 0 | 0 | 0.9 ppbbelow the action level |
| Cherokee Strip HOA & Water WA5312450 | 59 | 0 | 0 | 0 | 3.5 ppbbelow the action level |
| Detroit Water Service Assn WA5319095 | 57 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Harstine Island Estates Assn WA5331565 | 56 | 0 | 0 | 0 | 2.8 ppbbelow the action level |
| Pleasant Cove WA5367800 | 55 | 0 | 0 | 0 | 1.7 ppbbelow the action level |
| Spencer Glen WA5382963 | 55 | 0 | 0 | 0 | 3.2 ppbbelow the action level |
| Lake Christine Community Club WA5343793 | 53 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Clifton Pebble Beach WA5313850 | 52 | 0 | 0 | 0 | 1.5 ppbbelow the action level |
| Bolduc Community WA5307620 | 51 | 0 | 0 | 0 | 3 ppbbelow the action level |
| Tahja II WA5303052 | 51 | 0 | 0 | 0 | 2.8 ppbbelow the action level |
| Agate Beach WA5300510 | 48 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Little Mission Creek WA5301808 | 47 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Allyn Carey WA53AC551 | 45 | 0 | 0 | 0 | 3.8 ppbbelow the action level |
| Lakewood Community WA5345480 | 45 | 0 | 0 | 0 | 8.2 ppbbelow the action level |
| Ripplewood Tracts WA5372620 | 45 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Vineyard Cove Corporation WA5391917 | 44 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Canyonwood Beach Water Supply WA5311030 | 43 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Kamilche Shores WA5337595 | 43 | 0 | 0 | 0 | 4.5 ppbbelow the action level |
| Lakewood Manor Association WA5345400 | 42 | 0 | 0 | 0 | 1.5 ppbbelow the action level |
| Mountain View WA5311656 | 41 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Olympic Vista Club Community Water WA5363655 | 41 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Mountain Shores Cc WA5356780 | 40 | 0 | 0 | 0 | 2.5 ppbbelow the action level |
| Viewcrest Beach WA5391900 | 40 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Hipma WA5313701 | 39 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Kamilche Point Community Club WA5337590 | 39 | 0 | 0 | 0 | 0.8 ppbbelow the action level |
| Rainier View WA5326649 | 37 | 0 | 0 | 0 | 1 ppbbelow the action level |
| Bel Aire Cove WA5305243 | 32 | 0 | 0 | 0 | 0 ppbbelow the action level |
| Queen Anne Water Works LLC WA5304212 | 28 | 0 | 0 | 0 | 0.8 ppbbelow the action level |
| Rivendell Water Association WA5313679 | 28 | 0 | 0 | 0 | 2 ppbbelow the action level |
| Erickson Lake Tracts WA5354572 | 25 | 0 | 0 | 0 | 0.9 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 Mason 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.
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.
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.
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.
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 reportsResource 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 Mason County
9ZIP 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
- Belfair
- Grapeview
- Hoodsport
- Skokomish
- Union
View ZIP areas and understand coverage
- 98524Grapeview
- 98528Belfair
- 98546Grapeview
- 98548Hoodsport
- 98555
- 98560
- 98584Skokomish
- 98588
- 98592Union
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.
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.