Fresno Water Quality 2026
Reviewed by Joe Letorney, 30-year water treatment expert · Former WQA Certified Water Treatment Specialist (CWS), Level VI
Fresno sits in California's San Joaquin Valley, where agricultural runoff and legacy pesticides have long complicated drinking water. EPA UCMR5 monitoring detected PFAS with PFOS, PFOA, and PFHxS above federal limits in City of Fresno water.
Nitrate from fertilizer is a parallel valley issue — separate from PFAS but equally important for private wells nearby. City water is monitored; rural fringe wells may not be. Know which PWSID serves your address.
RO removes both nitrate and PFAS at the tap. Pitcher filters are inadequate for Fresno's PFAS profile. Many families also deal with hardness from groundwater blends — softener plus RO is a common dual setup in Central Valley homes.
See best water filters for lead removal and what filters remove PFAS.
Check water hardness in Fresno →
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 →
Fresno has significant water quality concerns including pfas at 47 ppt — 3 mcl violations. EPA legal limits are set based on treatment feasibility — not always on what independent health scientists consider safe. Certified filtration is strongly recommended for this water supply.
Fresnowater 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.
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
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
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
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
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 · CA utility avg: 35.03 ppb
Removes with: RO · Carbon
Can impair thyroid function — most concerning during pregnancy and childhood.
Removes with: RO · Carbon
From City of Fresno CCR 2024
Removes with: RO · Ion exchange
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: 700 ppb
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 43.45 ppb · CA utility avg: 50.81 ppb
Removes with: RO · Carbon · Ion exchange
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
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
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): 2.40 ppb · CA utility avg: 6.22 ppb
Removes with: RO · Carbon
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
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: 0.15 ppb
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 30.97 ppb · CA utility avg: 26.50 ppb
Removes with: RO · Carbon
Radioactive — long-term exposure increases kidney toxicity and cancer risk.
Removes with: RO · Ion exchange
EWG Tap Water Atlas utility average (2021–2023) · U.S. utility avg (EWG Atlas sample): 17.82 ppb · CA utility avg: 12.20 ppb
Removes with: RO · Carbon
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.
Fresno water tested at 47 ppt total PFAS in EPA UCMR5 monitoring — with PFOS (30 ppt), PFOA (16 ppt), and PFHxS (30 ppt) above EPA MCLs.
The City of Fresno draws primarily from surface water in the San Joaquin Valley — one of the most agriculturally intensive regions in the US.
1,2,3-TCP and arsenic from legacy pesticide use remain persistent concerns in Central Valley groundwater blends.
Only reverse osmosis certified to NSF 58 reliably removes PFAS, including short-chain compounds detected in Fresno water.
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.
Fresnoutility 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 Fresno'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
COMMON QUESTIONS
Is Fresno tap water safe to drink in 2026?
Fresno water meets EPA legal standards, but meeting legal standards is not the same as being free of health concerns. EPA limits are set based on treatment feasibility, not always on what independent scientists consider safe. Fresno has pfas at 47 ppt — 3 mcl violations which is a significant concern — certified filtration is strongly recommended.
Does Fresno water have PFAS?
EPA UCMR5 monitoring data for Fresno (water system CA1010007) is shown above. PFAS — sometimes called "forever chemicals" — are synthetic compounds that don't break down in the body. Only reverse osmosis systems or NSF 58-certified carbon block filters reliably remove PFAS from tap water. Standard pitcher filters do not remove PFAS.
Does Fresno water have lead?
Lead in tap water almost always comes from the pipes inside your home or building, not the treatment plant. Homes built before 1986 in Fresno are most at risk because they may have lead solder, brass fittings, or lead service lines. The EPA has no safe level for lead in children. An NSF/ANSI 53-certified filter or reverse osmosis system removes lead at the tap.
What water filter is best for Fresno?
For Fresno's water profile — pfas at 47 ppt — 3 mcl violations, pfos and pfoa above epa limits — a reverse osmosis system addresses the widest range of contaminants. Under-sink RO (Waterdrop G3P600, Aquasana SmartFlow) is the gold standard for homeowners. Renters can use a countertop RO like the Waterdrop K19-S Countertop RO — zero installation required. Clearly Filtered pitchers are the best non-RO option for PFAS and lead.
How do I get my Fresno water tested?
For the most accurate results for your specific tap, use a certified mail-in lab test rather than relying on city-wide data. SimpleLab Tap Score tests for 100+ contaminants including PFAS, lead, arsenic, and nitrates. Results come with a detailed health assessment and filter recommendations. City-wide EPA data like what you see above is a strong baseline, but your home's plumbing can add contaminants after the water leaves the treatment plant.
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