SEQUIM, Washington Tap Water Quality

26,173 people served · 39 water systems

Good

SEQUIM, Washington is a small city with 26,173 residents served by 39 distinct public water systems. Water service covers ZIP code 98382.

SEQUIM's water utilities have recorded a small number of EPA health-based violations in the last five years. These were resolved through standard corrective action.

EPA reporting identifies Lead among the regulated contaminants associated with SEQUIM's recent health-based violations. Each contaminant has different sources, health implications, and recommended mitigation steps — links to the full EPA reference for each are listed alongside the violation history below.

Last updated: 2026-05-18 · Source: EPA SDWIS

Location

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Centered on ZIP-code centroids of water systems serving this city.

ZIP Codes Served

98382

Health-Based Violations (Last 5 Years)

EPA Maximum Contaminant Level exceedances reported by water systems serving SEQUIM. Each entry explains the contaminant, the health risk, and recommended precautions, and links to a full guide.

Leadchemical

EPA Code 5000 · Treatment Technique Violation

violation

EPA Limit

0.015 mg/L

Last Reading

—

First Reported

Mar 2024

Most Recent

Mar 2024

What this violation means

Lead is a potent neurotoxin with no safe exposure level. In drinking water it primarily enters via corroded lead service lines, lead-soldered copper pipes, and brass fixtures. Children under 6 and pregnant women face the highest risk because lead disrupts developing nervous and skeletal systems.

Recommended precautions

→Run cold tap water 30–120 seconds before drinking or cooking, especially after the tap has been unused for hours.
→Never cook with hot tap water — heat increases lead leaching from pipes.
→Use an NSF/ANSI 53 certified filter for lead removal (carbon block or reverse osmosis).
→If you have children, get blood lead levels tested by your pediatrician.

Read the complete guide to Lead

Source: EPA Safe Drinking Water Information System (SDWIS). Health-based violations only. Older violations may have been resolved; check your utility's most recent Consumer Confidence Report for current status.

Water Systems Serving SEQUIM

PETERSON-WHITTAKER

PWSID: WA5301799

26 served

PALO VERDE

PWSID: WA5302315

30 served

ALDERWOOD EAST

PWSID: WA5301265

39 served

FOUR SEASONS PARK

PWSID: WA5300302

225 served

1 violation

MAPLE GROVE

PWSID: WA5363277

132 served

HEART O THE HILLS

PWSID: WA5302632

76 served

SUN MEADOWS

PWSID: WA5304511

295 served

LOUELLA HEIGHTS

PWSID: WA5300585

28 served

ESTATES INC

PWSID: WA5308166

1,043 served

Parkwood MFD Housing Community

PWSID: WA5302699

378 served

CARLSBORG MOBILE ESTATES

PWSID: WA5300029

69 served

MEADOWBROOK VILLAGE

PWSID: WA5310774

55 served

BRANDT POINT

PWSID: WA5316190

32 served

DISCOVERY BAY LEASEHOLDERS

PWSID: WA5314071

123 served

JAMESTOWN ON WILCOX LANE

PWSID: WA5306344

94 served

PANORAMA VISTA

PWSID: WA5306947

75 served

BUENA VISTA ESTATES

PWSID: WA5309155

42 served

OLYMPIC VIEW MOBILE PARK

PWSID: WA5319110

34 served

DUNGENESS BAY PLAT

PWSID: WA5320300

461 served

DUNGENESS BEACH

PWSID: WA5320350

181 served

DUNGENESS MEADOWS

PWSID: WA5320445

488 served

DISCOVERY BAY VILLAGE

PWSID: WA5319430

191 served

FOREST RIDGE

PWSID: WA5325949

65 served

GREEN ACRES MOBILE HOME PARK

PWSID: WA5329358

74 served

BAYWOOD VILLAGE MOBILE HOME PARK

PWSID: WA5336754

90 served

CEDAR GROVE MOBILE PARK

PWSID: WA5336836

40 served

HAPPY VALLEY ESTATES

PWSID: WA5330975

46 served

FLAURAS ACRES PROPERTYOWNER

PWSID: WA5325600

150 served

MONTERRA

PWSID: WA5355990

464 served

MAINS FARM PROPERTY OWNERS

PWSID: WA5350400

358 served

MADRONA RIDGE HOMEOWNERS

PWSID: WA5350085

65 served

OLYMPUS BEACH TRACTS

PWSID: WA5363700

143 served

VISTAS INC

PWSID: WA5358144

241 served

OLYMPIC VIEW

PWSID: WA5305151

33 served

WEST SEQUIM BAY INC

PWSID: WA5354192

2,759 served

SUNLAND WATER DISTRICT

PWSID: WA5385260

2,235 served

WOODLAND HEIGHTS

PWSID: WA5398182

105 served

SEQUIM CITY OF

PWSID: WA5377620

14,293 served

Solmar Water

PWSID: WA5381315

895 served

What Can You Do?

✅ Request your utility's annual Consumer Confidence Report (CCR) — required by law.
✅ Use an NSF-certified water filter if violations involve lead, arsenic, or PFAS.
✅ Run cold water for 30 seconds before drinking if you have older plumbing (reduces lead).
✅ Check back monthly — we update data from the EPA every 30 days.

About this data

This overview reflects EPA SDWIS data published as of 2026-05-18. It covers active Community Water Systems (CWS) that exceeded federal Maximum Contaminant Levels during the past five-year EPA reporting window. For up-to-the-minute information, request a current Consumer Confidence Report from your utility, or review the EPA's public dashboard.

Frequently Asked Questions

Is SEQUIM, Washington tap water safe to drink?▼

This city's water had minor EPA violations in the last 5 years.

How many EPA violations does SEQUIM have?▼

SEQUIM has 1 EPA health-based water violations in the last 5 years across 39 water systems serving 26,173 people.

What contaminants have been found in SEQUIM water?▼

The following EPA-regulated contaminants have been detected: 5000. View details about each contaminant, health effects, and recommended precautions above in the violations table.

Should I use a water filter in SEQUIM?▼

Using an NSF-certified water filter is recommended if your area has violations involving lead, arsenic, or PFAS. For other contaminants, consult your local water utility. Check the annual Consumer Confidence Report (CCR) for detailed guidance.

What should I do if there are violations in SEQUIM?▼

Request your water utility's annual Consumer Confidence Report (CCR), which is required by the EPA. Follow the utility's guidance on boil water advisories. Run cold water for 30 seconds before drinking if you have older plumbing. Use an NSF-certified filter if needed based on your water system's violations.