Washington Suburban Sanitary Commission (WSSC Water) Water Quality: What the EPA Records Show
Washington Suburban Sanitary Commission (WSSC Water), which serves about 1,900,000 people in the Maryland suburbs of Washington, DC (Montgomery and Prince George's counties), reported PFAS detections in the EPA’s UCMR5 monitoring (2023-2025), all below the current EPA limits. Occurrence data, not a compliance finding. Its most recent EPA-record lead 90th-percentile was non-detect (below the reporting limit) — under the current 15 ppb action level.
See the full interactive report for this system — every PFAS analyte, lead and copper rounds, violations, and the filter that handles what was found: open the system report → Or check YOUR exact ZIP: check your water by ZIP →
Beyond PFAS: state-record results over an EPA limit
- tthm: 115.91 ug/L (highest sample 2014-08-07; 2012-2019 records, not current)
- haa5: 90.2 ug/L (highest sample 2017-08-01; 2012-2019 records, not current)
These are the highest samples in the state/EPA record for this system — a snapshot, not a current reading; the utility’s Consumer Confidence Report is the official current record.
Common questions about the Maryland suburbs of Washington, DC (Montgomery and Prince George's counties) water
Is the Maryland suburbs of Washington, DC (Montgomery and Prince George's counties)'s tap water safe to drink?
Nothing in these records is above a current EPA limit, but there is something worth watching — a detection below the limit, an older exceedance, or a violation on record. See the card above. These are system-level records for public water systems, not a reading of any individual home’s tap, and they do not cover private wells. Confirm your own utility’s current Consumer Confidence Report, and test your tap if you’re unsure.
Does the Maryland suburbs of Washington, DC (Montgomery and Prince George's counties) have PFAS in its drinking water?
Washington Suburban Sanitary Commission (WSSC Water) reported PFAS detections below current EPA limits in UCMR5 monitoring.
Who supplies the Maryland suburbs of Washington, DC (Montgomery and Prince George's counties)'s drinking water?
Washington Suburban Sanitary Commission (WSSC Water) (PWSID MD0150005) serves about 1,900,000 people in the Maryland suburbs of Washington, DC (Montgomery and Prince George’s counties), per EPA SDWIS records. A metro area is usually served by more than one water system — this page covers the area’s largest. Suburbs and neighboring towns often have their own systems with their own results; check your exact ZIP for yours.
How do I check my exact address?
Water systems report by system, not by address. Enter your ZIP on the water checker to see the system(s) serving it and what each reported.
Statewide, 18.2% of Maryland’s UCMR5-tested systems reported PFOA or PFOS over the EPA limit — see the Maryland water page.
Other large systems in Maryland
See the 100 largest US water systems, water quality by state, and the national PFAS data study.
Sources: EPA UCMR5 occurrence data, Feb 2026 release (~95% complete; final reporting 2026) (2026-06); lead/copper + violations: EPA SDWIS via ECHO; population served: EPA SDWIS via ECHO (system-reported population served). PWSID MD0150005. Public-domain federal/state records; assembly by WaterByTheBook. Built 2026-07-25. Plain-markdown mirror: https://waterbythebook.com/md/washington-suburban-sanitary-commission-wssc-water.md