Sammamish, WA: 1 Violation - Home Safety 83/100
2 ZIP codes · 3 water systems · Updated
ZipCheckup grade for Sammamish: B.
This ZIP looks solid, with a few items worth a quick check.
In current WA EPA data, Sammamish's tap water sits in the high-safety tier.
How Sammamish Compares
Data: EPA SDWIS
What You Should Know About Sammamish Water
- Your city's water systems recorded 1 violation in the past 5 years.
- Average lead level: 0.0037 mg/L.
- Homes built before 1986: 31% - older plumbing may contain lead solder.
- Estimated remediation: $1,800 per household.
- CDC health risk index: 8.82.
Who Supplies Your Water in Sammamish
3 water systems are tracked federally in Sammamish, WA. The top 3 providers collectively serve most residential addresses, but because they operate independently, infrastructure maintenance standards and compliance histories differ from one service zone to another.
- B
- B
- B
Overview
We track home safety data for 2 ZIP codes in Sammamish, Washington (population ~56,081), covering 3 community water systems serving approximately 97,784 people region-wide. The EPA snapshots used for this build directly map water systems to 2 of 2 ZIP codes.
1 of 2 ZIP codes with a reported violation count in the available EPA record (50%) have recorded EPA violations. The available record reports no health-based violations for this measured scope.
Home Safety Score
Average Home Safety Score for Sammamish: B (83/100)
Model 4.0.0 uses four measured components across three equally weighted domains. If a required domain is unavailable, no score is published:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| PFAS MCL Screen | UCMR 5 testing against the covered federal MCLs |
| Radon Risk | EPA radon zone classification |
| Annual AQI | EPA AirData county-year median with at least 90 observed days |
Water Sources
Sammamish water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0037 mg/L (EPA action level: 0.015 mg/L)
- 0 of 2 ZIP codes with known status exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 3 (Low Risk)
- Zone 1 (High): 0 ZIP codes
- Zone 2 (Moderate): 0 ZIP codes
- Zone 3 (Low): 2 ZIP codes
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Lead | Inorganic | 2 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 98074 | B | 1 | 0 | Sammamish Plateau Water & Sewer |
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 98075 | B | Sammamish Plateau Water & Sewer | 79,362 |
All ZIP Codes in Sammamish
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Reporting periods vary by source. Missing data is shown as unavailable, not as zero.
Health Outcomes in Sammamish
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Top Contaminants in Sammamish Water
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Housing & Infrastructure in Sammamish
Housing age data helps assess potential lead pipe and infrastructure risks. Newer housing stock generally means lower plumbing-related contamination risk.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Prohibited from residential plumbing since 1986, lead solder divides Sammamish's housing stock along a timeline that the median build year of 1994 straddles. A meaningful share of homes predates the ban - a configuration that places moderate aggregate pressure on plumbing-related lead risk, distributed unevenly across neighborhoods.
Most homes in Sammamish were built after 1986, reducing the risk of lead contamination from plumbing. Older homes should still be tested.
Source: U.S. Census Bureau ACS B25034.
Cost Context: What Remediation Means for Sammamish Homeowners
Within the Sammamish market, estimated remediation claims a small portion of typical property equity - the financial burden is proportionally low.
Remediation costs in Sammamish are relatively low compared to home values. The $1,200–$2,600 estimated range is a small fraction of median property value. Home values are 212% above the Washington average.
Lead Exposure Risk for Children in Sammamish
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
Pulling a tap sample fills the gap that utility data cannot close, particularly here where 31% of housing dates from the pre-rule era and citywide monitoring sits at or above the regulatory mark in Sammamish.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Historical NFIP Claim Context in Sammamish
Historical NFIP data for Sammamish contains 27 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $16,647. Among ZIP codes with claim records, 100% have an A- or V-family dominant rated zone recorded in those historical claims. This is not a complete current FEMA property-map inventory.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. The <strong>$1,800</strong> remediation estimate shown here excludes flood insurance and is not derived from NFIP claim count.
Claim count does not establish current property risk. Check the exact address in FEMA's current map and obtain a property-specific insurance quote when relevant.
Source: historical FEMA National Flood Insurance Program (NFIP) claim records. No current FEMA property-map designation is asserted.
Deep Dive Reports
Detailed analysis for Sammamish, WA