Anderson Island, WA 98303

1 water system • 1,380 residents

Moderate water quality - consider filtration

C

Score: 43/100

Graded on EPA violations, contaminants, severity, compliance, and enforcement history. See methodology.

Data updated June 2026 • Sources: EPA ECHO and EPA Envirofacts

23

Contaminants Detected

69

Violations on Record

1

Health-Based Violations

0

Recent Violations

Grade Breakdown

Contaminant Count2 / 25
Violation History16 / 25
Contaminant Severity24 / 25
System Compliance0 / 15
Enforcement History0 / 10
Total Score43%

43 / 100 points

Recommended Water Filters

  • ✓Ultraviolet (UV) Purification
Compare filter types in our Filter Guide →

Consult a water quality specialist for personalized recommendations.

Anderson Island vs WA & National Average

Detected Contaminants

23 contaminants detected across water systems serving this ZIP code

ContaminantCategory
Coliform (TCR)Microorganism
Revised Total Coliform RuleMicroorganism
1,1,1-TrichloroethaneOther
1,1,2-TrichloroethaneOther
1,2-DichloropropaneOther
Consumer Confidence RuleOther
DICHLOROMETHANEOther
1,1-DichloroethyleneVolatile Organic
1,2-DichloroethaneVolatile Organic
1,2,4-TrichlorobenzeneVolatile Organic
BenzeneVolatile Organic
Carbon tetrachlorideVolatile Organic
CHLOROBENZENEVolatile Organic
cis-1,2-DichloroethyleneVolatile Organic
EthylbenzeneVolatile Organic
o-DichlorobenzeneVolatile Organic
p-DichlorobenzeneVolatile Organic
StyreneVolatile Organic
TetrachloroethyleneVolatile Organic
TolueneVolatile Organic
trans-1,2-DichloroethyleneVolatile Organic
TrichloroethyleneVolatile Organic
Vinyl chlorideVolatile Organic

Water System Information

Systems Serving This ZIP:
LAKE JOSEPHINE RIVIERA
Population Served:
1,380
Systems With Violations:
1 of 1
Major Violations:
66
Enforcement Actions:
69

Nearby Areas

98516

Olympia • 4.6 mi away

D

98327

Dupont • 5.1 mi away

A

98333

Fox Island • 7.3 mi away

F

98506

Olympia • 8.5 mi away

A

98499

Lakewood • 9.6 mi away

B

98466

Tacoma • 9.9 mi away

C

Frequently Asked Questions

What does the grade mean?

Our A–F grade ranks this ZIP code's water quality against every other analyzed ZIP in the country, based on EPA data. A = among the best, F = among the most troubled.

Is my tap water safe to drink?

Water systems regulated by the EPA must comply with Safe Drinking Water Act standards. However, if you're concerned about water quality, consider a water filter appropriate for your contaminants.

How often is the data updated?

We update our data quarterly with the latest EPA ECHO and Envirofacts data. Historical violations are tracked to identify patterns.

What filters do you recommend?

Filter recommendations are based on detected contaminants in your area. See our Filter Guide for detailed information about different filter types.