Alderwood Water District
EPA ID: WA5301300 · 245,715 people served · 12 ZIP codes
ZipCheckup's reading of EPA records for Alderwood Water District (WA5301300): a lead 90th-percentile reading above the EPA action level. Alderwood Water District is listed without violations in federal records, across a service area of 245,715 people.
Data: EPA SDWIS
Service Area Map
Coverage area for Alderwood Water District Source: EPA SDWIS service area boundaries.
Service area boundary - average Home Safety grade of mapped ZIPs: A
Demographics of ZIP Codes Served
The ZIP codes associated with Alderwood Water District have a median household income of $114,577 and about 463,179 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 46% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
🌊 Where Does Your Water Come From?
Alderwood Water District's water is drawn from rivers, lakes, or reservoirs. Surface water sources are more exposed to agricultural runoff, stormwater, and upstream discharges, but they typically receive more intensive treatment before reaching your tap.
Infrastructure Risk
PFAS in ZIP Codes This System Serves
PFAS ("forever chemicals") have been reported in samples from water systems associated with the ZIP codes in this system's area. These results can come from other water systems serving the same ZIP codes; check the UCMR5 section for any results reported for this system. 9 detections recorded.
Comparable Water Systems
Similar-sized systems in Washington
Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
Alderwood Water District (EPA ID: WA5301300) is a community water system in Washington that serves approximately 245,715 people from surface water sources.
This system provides water to 12 ZIP codes across 8 communities.
ZIP-Area Home Safety Context: A (100/100)
This is the average Home Safety Score for 5 of 12 service-area ZIP codes with all required score domains observed. It is not a grade for the water utility.
Model 4.0.0 uses SDWIS identity plus accepted ECHO SDWA lifecycle-based water compliance, the UCMR 5 PFAS MCL screen, EPA radon zone, and annual EPA AirData AQI across three equally weighted domains. Missing required evidence suppresses the score.
Violation History
Lead & Copper
Latest reported 90th-percentile lead result for this PWSID: 0.028 mg/L (1992-06-30).
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
Radon Risk in Service Area
12 of 12 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.
ZIP Codes Served
Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by WA or modeled from parcel and building-footprint data.
- 98012 - Bothell
- 98021 - Bothell
- 98026 - Edmonds
- 98036 - Lynnwood
- 98037 - Lynnwood
- 98043 - Mountlake Terrace
- 98072 - Woodinville
- 98087 - Lynnwood
- 98204 - Everett
- 98208 - Everett
- 98275 - Mukilteo
- 98296 - Snohomish
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Alderwood Water District (WA5301300) on EPA.gov.
Frequently Asked Questions
Is Alderwood Water District water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Alderwood Water District in the inclusive 2021-2026 record-year window. This is a compliance-record finding, not a guarantee about water at a specific tap.
How many people does Alderwood Water District serve?
Alderwood Water District serves approximately 245,715 people across 12 ZIP codes in Washington.
Where does Alderwood Water District get its water?
The primary water source is surface water.
Federal UCMR5 PFAS Monitoring: No PFAS Reported Above Reporting Levels
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). No PFAS compounds were reported above UCMR5 minimum reporting levels.
EPA's April 2024 PFAS rule sets MCLs of 4 ppt for PFOA and PFOS and 10 ppt for PFHxS, PFNA and HFPO-DA (GenX); water systems must comply from 2029. Other PFAS compounds have no individual federal MCL. A state standard is shown only where this system's state has its own enforceable PFAS limit. Detection results are EPA UCMR5 samples, not a measurement at your tap.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Alderwood Water District, WA: Serves 246K People. https://zipcheckup.com/water-system/wa5301300/
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