Bethesda, MD tap water: what’s in it in 2026
Reviewed by Joe Letorney, 30-year water treatment expert · Former WQA Certified Water Treatment Specialist (CWS), Level VI
See best water filters for lead removal and what filters remove PFAS.
Serving 68K residents via Washington Suburban Sanitary Commission (WSSC Water) · Bethesda, MD drinking water is supplied by Washington Suburban Sanitary Commission (WSSC Water). EPA and public water system monitoring commonly focus on issues such as Disinfection byproducts, PFAS monitoring, Lead in older home plumbing. Bethesda shares WSSC finished water with Rockville, Silver Spring, and Gaithersburg — check your ZIP for UCMR5 PFAS results, SDWIS history, and the right NSF-certified filter for older-home lead risk.
Check water hardness in Bethesda →
WaterCheckup Safety Score — an independent index from EPA public data and our formula. Not your utility’s official water quality rating, an EPA compliance grade, or a test of water at your tap. How we score →
Bethesda water currently shows no major violations in EPA monitoring data. That said, your home's internal plumbing can add lead or other contaminants after water leaves the treatment plant — especially in homes built before 1986.
Bethesdawater may meet federal EPA limits while still showing contaminants above independent health guidelines (EWG, state advisories). EPA MCLs are often set on treatment feasibility — not a "zero risk" threshold. Compare levels below to health guidelines and state/U.S. utility averages, then see which filter technologies address your profile.
EPA UCMR5 PFAS plus utility/EWG averages from our contaminant bundle. Run a ZIP report for live SDWIS samples at your address.
EWG health guideline: 0.15 ppb
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 30.97 ppb · MD utility avg: 51.43 ppb
Removes with: RO · Carbon
EWG health guideline: 0.06 ppb (HAA5)
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 21.57 ppb · MD utility avg: 32.43 ppb
Removes with: RO · Carbon
From WSSC Water CCR 2024
Removes with: RO · Ion exchange
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 23.64 ppb · MD utility avg: 34.80 ppb
Removes with: RO · Carbon
EWG health guideline: 700 ppb
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 43.45 ppb · MD utility avg: 35.90 ppb
Removes with: RO · Carbon · Ion exchange
EWG health guideline: 100 ppb
Long-term exposure at high levels may affect the nervous system. Staining and taste issues at lower levels.
Removes with: RO · Carbon
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 17.82 ppb · MD utility avg: 19.80 ppb
Removes with: RO · Carbon
Can impair thyroid function — most concerning during pregnancy and childhood.
Removes with: RO · Carbon
PFAS (“forever chemicals”) persist in the body. NSF 58 reverse osmosis or NSF P473-certified filters remove PFAS at the tap — standard pitchers do not.
Removes with: RO · Carbon
EWG health guideline: 0.06 ppb
THM component linked to cancer and reproductive harm with long-term exposure.
Removes with: RO · Carbon
EWG health guideline: 0.02 ppb
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 3.86 ppb
Removes with: RO · Carbon
PFAS (“forever chemicals”) persist in the body. NSF 58 reverse osmosis or NSF P473-certified filters remove PFAS at the tap — standard pitchers do not.
Removes with: RO · Carbon
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 3.00 ppt · MD utility avg: 1.88 ppt
Removes with: RO
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 2.85 ppt · MD utility avg: 1.26 ppt
Removes with: RO
EWG health guideline: 0.1 ppb
THM component linked to cancer and harm to fetal development.
Removes with: RO · Carbon
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 1.04 ppm · MD utility avg: 1.23 ppm
Removes with: RO · Carbon
EWG health guideline: 0.14 ppm
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 1.10 ppm · MD utility avg: 1.14 ppm
Removes with: RO
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 0.49 ppm · MD utility avg: 0.66 ppm
Removes with: RO · Ion exchange
U.S. and state averages from EWG Tap Water Atlas utilities in our database. For your exact tap, use a ZIP report — home plumbing can differ from utility averages.
Bethesda is served by WSSC Water alongside Rockville, Silver Spring, and Gaithersburg.
Surface-water DBPs and UCMR5 PFAS monitoring are the main system-wide watch items for WSSC customers.
Many Bethesda homes predate 1986 — test kitchen taps for lead if you have infants or are renovating older plumbing.
NSF 58 reverse osmosis covers PFAS, lead at the tap, and disinfection byproducts in one under-sink system.
Source: EPA UCMR5 national monitoring dataset · Testing period 2023–2025 · MCL = Maximum Contaminant Level (legally enforceable limit) · Health limit = EPA health advisory threshold
Reference matrix — not specific brands. NSF-certified carbon blocks, reverse osmosis (NSF 58), and ion-exchange softeners address different contaminants. Product picks below match this profile.
Bethesdautility data is a strong baseline — but lead often comes from your home's pipes, and PFAS can vary by neighborhood. Choose certified lab testing for certainty, or skip straight to NSF-certified filters matched to this profile.
SimpleLab Tap Score mail-in panels test PFAS, lead, nitrates, bacteria, and 100+ contaminants at your kitchen tap. Results in about a week — then pick filtration with real numbers, not guesses.
Tap Score City Test — from $89 →Accredited labs · Best if you have old plumbing, pregnancy, or want proof before installing RO
Get NSF 58 / NSF 53 picks matched to Bethesda's PFAS, lead, and disinfection byproduct profile — reviewed by a 30-year water treatment expert.
Take the 3-question filter quiz →Best when contaminants are already flagged above and you want the right RO or pitcher today
Certified Filter Recommendations
Matched to what's actually in your water
FREQUENTLY ASKED QUESTIONS
Is Bethesda, MD tap water safe to drink?
Yes. Bethesda is served by WSSC Water, the same utility covering most of Montgomery County, and its water meets all federal EPA legal limits. Meeting legal compliance isn't the same as being free of all health concerns — EPA limits reflect treatment feasibility more than the lowest levels independent researchers recommend.
Where does Bethesda's tap water come from?
Bethesda draws from the WSSC Water system, sourced primarily from the Potomac and Patuxent Rivers, shared across Montgomery and Prince George's counties. Because it's the same regional treatment system, water quality is broadly consistent across WSSC communities — plumbing age in individual homes tends to matter more than which specific city you're in.
Does Bethesda have lead pipe risk?
Bethesda has a substantial number of homes built before the 1986 nationwide lead pipe ban, particularly in its older, established neighborhoods. Lead can leach from aging service lines or solder even though WSSC's treated water meets federal lead standards at the source. A lead test or certified filter is a reasonable precaution for older homes.
Does Bethesda have hard water?
Bethesda's water hardness is consistent with the broader WSSC service area, since it shares the same Potomac/Patuxent source as neighboring Montgomery County communities. A home water test is the most reliable way to confirm your specific reading.
Is there PFAS in Bethesda's water?
Bethesda is covered under the same UCMR5 PFAS monitoring program as the rest of the WSSC service area. Households wanting protection beyond current utility compliance levels commonly choose an NSF/ANSI 53 or 58-certified filter rated for PFAS removal.
As of October 2024, all US public water systems must publish a public inventory of their lead service lines — the pipes connecting the water main to your home. Even if your public water system water tests clean at the treatment plant, lead can leach from these pipes into your tap. Homes built before 1986 are most at risk.
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City-wide data is just the start. Enter your ZIP to see your exact water system's EPA report, PFAS levels, and violation history — then get the right filter for your home.
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Reviewed by Joe Letorney, 30-year water treatment expert · Former WQA Certified Water Treatment Specialist (CWS), Level VI