Washington Suburban Sanitary Commission
EPA ID: MD0150005 · 1,900,000 people served · 81 ZIP codes
ZipCheckup's reading of EPA records for Washington Suburban Sanitary Commission (MD0150005): no drinking-water violations recorded since 2021. Nothing in the federal violation file is listed against Washington Suburban Sanitary Commission, a system that provides water to roughly 1,900,000 people.
Data: EPA SDWIS
Service Area Map
Coverage area for Washington Suburban Sanitary Commission Source: EPA SDWIS service area boundaries.
Service area boundary - average Home Safety grade of mapped ZIPs: B
Demographics of ZIP Codes Served
The ZIP codes associated with Washington Suburban Sanitary Commission have a median household income of $122,683 and about 2,065,872 residents live in those ZIP codes (Census; not the number of people this system supplies). Approximately 62% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
🌊 Where Does Your Water Come From?
Washington Suburban Sanitary Commission'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. 167 detections recorded. 2 detections are above the level of a federal PFAS MCL (4 ppt for PFOA and PFOS), with compliance required from 2029.
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
Washington Suburban Sanitary Commission (EPA ID: MD0150005) is a community water system in Maryland that serves approximately 1,900,000 people from surface water sources.
This system provides water to 81 ZIP codes across 51 communities.
ZIP-Area Home Safety Context: B (74/100)
This is the average Home Safety Score for 71 of 81 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
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| Below the reporting limit | No | 2020-12-31 |
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
45 of 81 ZIP records with known zones are in EPA Radon Zone 1. 36 of 81 ZIP records with known zones are in EPA Radon Zone 2.
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 MD or modeled from parcel and building-footprint data.
This system serves 81 ZIP codes:
20601 · 20607 · 20613 · 20623 · 20705 20706 · 20707 · 20708 · 20710 · 20712 20715 · 20716 · 20720 · 20721 · 20722 20735 · 20737 · 20740 · 20742 · 20743 20744 · 20745 · 20746 · 20747 · 20748 20762 · 20769 · 20770 · 20771 · 20772 20774 · 20781 · 20782 · 20783 · 20784 20785 · 20812 · 20814 · 20815 · 20816 20817 · 20818 · 20832 · 20833 · 20841 20850 · 20851 · 20852 · 20853 · 20854 20855 · 20860 · 20861 · 20862 · 20866 20868 · 20871 · 20872 · 20874 · 20876 20877 · 20878 · 20879 · 20880 · 20882 20886 · 20889 · 20892 · 20894 · 20895 20896 · 20899 · 20901 · 20902 · 20903 20904 · 20905 · 20906 · 20910 · 20912 21771
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View available EPA compliance records for Washington Suburban Sanitary Commission (MD0150005) on EPA.gov.
Frequently Asked Questions
Is Washington Suburban Sanitary Commission water safe to drink?
The accepted 2026Q2 ECHO snapshot contains zero violation records for Washington Suburban Sanitary Commission 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 Washington Suburban Sanitary Commission serve?
Washington Suburban Sanitary Commission serves approximately 1,900,000 people across 81 ZIP codes in Maryland.
Where does Washington Suburban Sanitary Commission get its water?
The primary water source is surface water.
Federal UCMR5 PFAS Monitoring: Detected
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). PFAS compounds were detected; the table compares each one with the EPA MCL where one exists (April 2024 rule, compliance required from 2029) and with this state's enforceable standard where one exists.
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 →
How Water Systems Appear in Rankings
Water systems are evaluated by violation history, contaminant detections, and service population. Larger systems with more service connections appear in more rankings.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Washington Suburban Sanitary Commission: Serves 1.9M People. https://zipcheckup.com/water-system/md0150005/
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