Maple Valley, WA: 4 Violations — 78/100 (2026)
1 ZIP code · 8 water systems · Updated 2026-06-03
Water utilities in Maple Valley have maintained a consistent compliance record over recent monitoring periods — the city's above-average grade in WA reflects low violation rates and no systemic health concerns flagged in current data.
How Maple Valley Compares
Data: EPA SDWIS Last verified: 2026-06-03
Key Facts for Maple Valley Residents
- Your city's water systems recorded 4 violations in the past 5 years.
- Average lead level: 0.0013 mg/L.
- Homes built before 1986: 28% — older plumbing may contain lead solder.
- Estimated remediation: $1,800 per household.
- CDC health risk index: 8.82.
Maple Valley's Water Providers
Residential addresses in Maple Valley, WA are served by 3 primary water providers out of 8 systems in federal records. Each system maintains separate infrastructure and files its own EPA compliance reports, so service conditions are not uniform across the city.
Overview
We track water quality and home safety data for 1 ZIP code in Maple Valley, Washington (population ~37,868), covering 8 community water systems serving approximately 103,893 people region-wide.
1 of 1 ZIP code (100%) have recorded EPA violations. All violations are monitoring/reporting type.
Home Safety Score
Average Home Safety Score for Maple Valley: B (78/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Maple Valley water systems draw from: Groundwater, Surface water.
Lead & Copper
- Average lead level (90th percentile): 0.0013 mg/L (EPA action level: 0.015 mg/L)
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 3 (Low Risk)
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Consumer Confidence Report Rule | Reporting | 4 | 1 |
| Lead | Inorganic | 2 | 1 |
| Stage 1 DBP Rule | Treatment Technique | 2 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 98038 | B | 4 | 0 | Cedar River Water & Sewer District |
All ZIP Codes in Maple Valley
- 98038 [B] — 4 violations
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
Updated daily.
Maple Valley Community Health Snapshot
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
What's in Maple Valley's Water?
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
Maple Valley Infrastructure Age
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
A median build year of 1993 in Maple Valley points to a housing stock where post-1986 construction is the norm. That matters because lead solder in plumbing — banned federally in 1986 — is a primary pathway by which older homes can elevate tap water lead above what enters the distribution system.
Most homes in Maple Valley 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.
How Remediation Costs Compare in Maple Valley
Within the Maple Valley market, estimated remediation claims a small portion of typical property equity — the financial burden is proportionally low.
Remediation costs in Maple Valley 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 53% above the Washington average.
Maple Valley: Lead Risk & Vulnerable Populations
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.
Even with citywide samples reading clean and just 28% of Maple Valley homes dating to the pre-rule era, individual-faucet conditions remain a separate question that aggregate utility data cannot resolve for one specific address. That gap is structural, not a function of severity.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Maple Valley: Flood History & Water Damage Risk
FEMA data shows 100% of Maple Valley's ZIP codes mapped into designated flood zones, paired with an NFIP record of 209 claims. That footprint places local flood exposure in the range where it warrants attention without rising to high-severity planning territory.
Maple Valley has a moderate flood history with 209 FEMA claims averaging $18,896 per payout. 100% of ZIP codes fall within FEMA flood zones. Flood events can contaminate drinking water and overwhelm treatment systems.
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. Flood damage can add significantly to the estimated <strong>$1,800</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
Deep Dive Reports
Detailed analysis for Maple Valley, WA