Issaquah, WA: 6 Violations - Home Safety 91/100
2 ZIP codes · 8 water systems · Updated
ZipCheckup grade for Issaquah: A.
Checked records flag no major concern; missing data is unknown.
Across Issaquah, WA, the overall grade falls in the upper range - a summary score, not a measurement taken at any single tap.
How Issaquah Compares
Data: EPA SDWIS
Issaquah Water: The Quick Version
- Your city's water systems recorded 6 violations since 2021.
- Average of reported 90th-percentile lead results: 0.0039 mg/L.
- Homes built before 1986: 31% - older plumbing may contain lead solder.
- Estimated remediation: $600 per household.
- Health risk index (ZipCheckup composite of CDC data): 8.82.
Water Systems Serving Issaquah
Service in Issaquah, WA can differ by address: 8 water systems are tied to the area in federal records, and the 3 largest are listed with their violation records.
- A
- B
- B
Overview
We track home safety data for 2 ZIP codes in Issaquah, Washington (population ~59,265), covering 8 community water systems serving approximately 489,814 people region-wide. The EPA snapshots used for this build directly map water systems to 2 of 2 ZIP codes.
2 of 2 ZIP codes with a reported violation count in the available EPA record (100%) have recorded EPA violations. The available record reports no health-based violations for this measured scope.
Home Safety Score
Average Home Safety Score for Issaquah: A (91/100)
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
Issaquah water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average of reported 90th-percentile lead results: 0.0039 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
2 of 2 ZIP records with known zones are in EPA Radon Zone 3.
The EPA recommends testing all homes regardless of radon zone. County radon zones cannot replace an in-home radon test.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Consumer Confidence Rule | Reporting | 7 | 2 |
| Nitrate | Inorganic | 2 | 1 |
| Lead and Copper Rule | Treatment Technique | 2 | 1 |
| Revised Total Coliform Rule | Microbiological | 2 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 98027 | A | 6 | 0 | Issaquah Water System |
| 98029 | B | 1 | 0 | Sammamish Plateau Water & Sewer |
All ZIP Codes in Issaquah
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.
CDC Health Data for Issaquah
Source: CDC PLACES (County-level estimates). County health indicators are shown for context only and are not linked to this area's water records.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Key Contaminants Detected in Issaquah
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
How Old Is Issaquah's Housing Stock?
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
Issaquah's housing spans eras before and after 1986; its median build year is 1995.
Most homes in Issaquah were built after 1986; lead exposure at a tap still depends on its service line and plumbing. Older homes should still be tested.
Source: U.S. Census Bureau ACS B25034.
Issaquah: Remediation Cost in Perspective
Low tier for Issaquah: remediation estimated at up to 1% of what homes are worth.
Estimated remediation costs in Issaquah can be compared with local home values. The $400–$800 estimated range can be set against the median property value; actual costs vary by home. Home values are 109% above the Washington average.
Protecting Children from Lead in Issaquah
Why children are most at risk: The CDC states that no safe blood lead level in children has been identified. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
If you have young children or are pregnant, consider testing your home's water - especially if your home was built before 1986.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Historical Flood-Claim Evidence for Issaquah
Historical NFIP data for Issaquah contains 243 flood insurance claims. Among claims with payment data, the average reported building, contents, and ICC component sum is $29,594. Among ZIP codes with claim records, 50% 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 $600 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 Issaquah, WA