Is Fresno Tap Water Safe to Drink?
Short answer: In the 2023–2025 records we hold for Fresno, three PFAS, PFHxS, PFOA and PFOS, each had a sample above a 2024 EPA limit (not a violation: the limits are judged on a yearly average, due 2029). 4 more are detected with no federal limit, and everything else measured is within its reference or not detected. 10 substances were detected and 21 were tested and not detected. The water is from City of Fresno, serving 545,970 residents.
- Year 2026
- Utility City of Fresno
- Coverage 31 records
- Updated 2026-10-15
Where Fresno’s water comes from
- Utility
- City of Fresno
- Water system
- CITY OF FRESNO · CA1010007
- Source water
- Surface water
- Disinfectant
- not on record
- Population served
- 545,970
- Reporting period
- Sampled 2023–2025
- Monitoring coverage
- 31 records · 3 of 4 groups measured
- Your water utility
- City of Fresno: contact and record
EPA lists this system for the city. Your water bill or annual water quality report names your actual supplier. Source: EPA SDWIS 2026Q2.
- CITY OF FRESNOThis reportCA1010007 · 545,970 served
- 1Source
Surface water
- 2Treatment
The treatment details are not on record.
- 3Distribution
Mains, then your building’s service line.
- 4Your tap
Plumbing inside the building is outside this record.
Fresno water in four numbers
Three PFAS, PFHxS, PFOA and PFOS, each had a sample above a 2024 EPA limit (not a violation: the limits are judged on a yearly average, due 2029); 4 more are detected with no federal limit, and everything else measured is within its reference or not detected.
10 detected results, by distance from their limit
Each bar runs to the named reference; the tick marks it. Open a row for five layers: measured, compared, meaning, where it matters, what to do.Perfluorooctanesulfonic acid (PFOS)Above EPA's 2024 limit (one sample) · Federal MCL4.0 ng/L federal MCL (2024)30ng/L
30 ng/L, sampled 2023-03-01 to 2025-12-16. EPA UCMR 5.
4.0 ng/L federal MCL (2024): a legal limit. That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation. EPA health goal (MCLG): 0.
One EPA sample measured 30 ng/L, above the 4 ng/L limit EPA set in 2024. That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation.
Comes with the source water; home plumbing does not add it.
Test your own tap first. To reduce it: Reverse osmosis, or carbon certified for PFAS (NSF/ANSI 53 or 58 (PFOA/PFOS)).
Perfluorooctanoic acid (PFOA)Above EPA's 2024 limit (one sample) · Federal MCL4.0 ng/L federal MCL (2024)16ng/L
16 ng/L, sampled 2023-03-01 to 2025-12-16. EPA UCMR 5.
4.0 ng/L federal MCL (2024): a legal limit. That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation. EPA health goal (MCLG): 0.
One EPA sample measured 16 ng/L, above the 4 ng/L limit EPA set in 2024. That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation.
Comes with the source water; home plumbing does not add it.
Test your own tap first. To reduce it: Reverse osmosis, or carbon certified for PFAS (NSF/ANSI 53 or 58 (PFOA/PFOS)).
Perfluorohexanesulfonic acid (PFHxS)Above EPA's 2024 limit (one sample) · Federal MCL10 ng/L federal MCL (2024)30ng/L
30 ng/L, sampled 2023-03-01 to 2025-12-16. EPA UCMR 5.
10 ng/L federal MCL (2024): a legal limit. That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation.
One EPA sample measured 30 ng/L, above the 10 ng/L limit EPA set in 2024. That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation.
Comes with the source water; home plumbing does not add it.
Test your own tap first. To reduce it: Reverse osmosis, or carbon certified for PFAS (NSF/ANSI 53 or 58, with PFHxS named on the listing).
Perfluorononanoic acid (PFNA)Within reference · Federal MCL10 ng/L federal MCL (2024)8ng/L
8 ng/L, sampled 2023-03-01 to 2025-12-16. EPA UCMR 5.
10 ng/L federal MCL (2024): a legal limit. That limit is judged on a yearly average, and water systems have until 2029 to meet it. EPA health goal (MCLG): 10 ng/L.
Detected at up to 8 ng/L (below the 10 ng/L limit EPA set in 2024). That limit is judged on a yearly average, and water systems have until 2029 to meet it.
Comes with the source water; home plumbing does not add it.
Test your own tap first. To reduce it: Reverse osmosis, or carbon certified for PFAS (NSF/ANSI 53 or 58, with PFNA named on the listing).
Perfluorobutanesulfonic acid (PFBS)Within reference · Screening level2,000 ng/L EPA health advisory (screening, not a legal limit)8.6ng/L
8.6 ng/L, sampled 2023-03-01 to 2025-12-16. EPA UCMR 5.
2,000 ng/L EPA health advisory (screening, not a legal limit).
Detected at up to 8.6 ng/L (below the 2,000 ng/L EPA health advisory; a screening level, not a legal limit).
Comes with the source water; home plumbing does not add it.
Test your own tap first. To reduce it: Reverse osmosis, or carbon certified for PFAS (NSF/ANSI 53 or 58, with PFBS named on the listing).
Perfluorohexanoic acid (PFHxA)Within reference · State limit400,000 ng/L Michigan EGLE state MCL (strictest US state)34ng/L
34 ng/L, sampled 2023-03-01 to 2025-12-16. EPA UCMR 5.
400,000 ng/L Michigan EGLE state MCL (strictest US state): a state limit.
Detected at up to 34 ng/L (below the 400,000 ng/L historical comparison reference).
Comes with the source water; home plumbing does not add it.
Test your own tap first. To reduce it: Reverse osmosis, or carbon certified for PFAS (NSF/ANSI 53 or 58, with PFHxA named on the listing).
Perfluorobutanoic acid (PFBA)Detected · no limit · No federal limitNo federal or state limit; shown for transparency26ng/L
26 ng/L, sampled 2023-03-01 to 2025-12-16. EPA UCMR 5.
No federal limit is on record for it.
Detected at up to 26 ng/L. No federal or state limit exists for this substance; shown for transparency, not graded.
Comes with the source water; home plumbing does not add it.
Test your own tap first. To reduce it: Reverse osmosis, or carbon certified for PFAS (NSF/ANSI 53 or 58, with PFBA named on the listing).
Perfluoroheptanoic acid (PFHpA)Detected · no limit · No federal limitNo federal or state limit; shown for transparency31ng/L
31 ng/L, sampled 2023-03-01 to 2025-12-16. EPA UCMR 5.
No federal limit is on record for it.
Detected at up to 31 ng/L. No federal or state limit exists for this substance; shown for transparency, not graded.
Comes with the source water; home plumbing does not add it.
Test your own tap first. To reduce it: Reverse osmosis, or carbon certified for PFAS (NSF/ANSI 53 or 58, with PFHpA named on the listing).
Perfluoropentanesulfonic acid (PFPeS)Detected · no limit · No federal limitNo federal or state limit; shown for transparency5.3ng/L
5.3 ng/L, sampled 2023-03-01 to 2025-12-16. EPA UCMR 5.
No federal limit is on record for it.
Detected at up to 5.3 ng/L. No federal or state limit exists for this substance; shown for transparency, not graded.
Comes with the source water; home plumbing does not add it.
Test your own tap first. To reduce it: Reverse osmosis, or carbon certified for PFAS (NSF/ANSI 53 or 58, with PFPeS named on the listing).
Perfluoropentanoic acid (PFPeA)Detected · no limit · No federal limitNo federal or state limit; shown for transparency47ng/L
47 ng/L, sampled 2023-03-01 to 2025-12-16. EPA UCMR 5.
No federal limit is on record for it.
Detected at up to 47 ng/L. No federal or state limit exists for this substance; shown for transparency, not graded.
Comes with the source water; home plumbing does not add it.
Test your own tap first. To reduce it: Reverse osmosis, or carbon certified for PFAS (NSF/ANSI 53 or 58, with PFPeA named on the listing).
21 others tested, none detectedshow
- 11Cl-PF3OUdS
- 8:2 FTS
- 4:2 FTS
- 6:2 FTS
- ADONA
- 9Cl-PF3ONS
- HFPO-DA (GenX)
- Lead (90th percentile)
- Lithium
- NEtFOSAA
- NMeFOSAA
- NFDHA
- PFEESA
- PFMPA
- PFMBA
- PFDA
- PFDoA
- PFHpS
- PFTA
- PFTrDA
- PFUnA
CITY OF FRESNO (EPA PWSID CA1010007) delivers surface water to 545,970 residents. This report reflects 29 individual PFAS result(s) from the source UCMR5 observations and the latest Lead & Copper Rule 90th-percentile result. Water hardness and disinfectant type are pending the utility's own annual report.
0health-based violations in the last 10 years
From EPA SDWIS. A clean violation history means no enforcement action was recorded; it does not cover contaminants without a limit.
No result is not a pass. Your utility's annual water quality report may list them, and a certified lab test covers your own tap.
Your tap can differ from the city record
The record describes water leaving treatment and samples across the system. Pipes, solder and fixtures inside a building can add lead the record can’t see, especially in older buildings with lead service lines.
Test your water- CityTreated water
Measured in this report
- MainsDistribution network
Sampled across the system
- BuildingService line and plumbing
Not in this record
- TapYour glass
Only a tap test measures it
Three steps from a record to your glass
- 01Test
Know what comes from your tap, starting with a first-draw lead sample.
- 02Match
Compare each result with its named reference in our test reader.
- 03Treat
Choose a technology certified for what your test found.
What can reduce what was found here
Finding → technology → certification → product, in that order. The reference type carries the meaning; there is no severity score.| Finding | Reference type | Technology | Certification to check |
|---|---|---|---|
| Perfluorooctanesulfonic acid (PFOS)30 ng/L | Federal MCL | Reverse osmosis, or carbon certified for PFAS | NSF/ANSI 53 or 58 (PFOA/PFOS) |
| Perfluorooctanoic acid (PFOA)16 ng/L | Federal MCL | Reverse osmosis, or carbon certified for PFAS | NSF/ANSI 53 or 58 (PFOA/PFOS) |
| Perfluorohexanesulfonic acid (PFHxS)30 ng/L | Federal MCL | Reverse osmosis, or carbon certified for PFAS | NSF/ANSI 53 or 58, with PFHxS named on the listing |
| Perfluorononanoic acid (PFNA)8 ng/L | Federal MCL | Reverse osmosis, or carbon certified for PFAS | NSF/ANSI 53 or 58, with PFNA named on the listing |
| Perfluorobutanesulfonic acid (PFBS)8.6 ng/L | Screening level | Reverse osmosis, or carbon certified for PFAS | NSF/ANSI 53 or 58, with PFBS named on the listing |
| Perfluorohexanoic acid (PFHxA)34 ng/L | State limit | Reverse osmosis, or carbon certified for PFAS | NSF/ANSI 53 or 58, with PFHxA named on the listing |
| Perfluorobutanoic acid (PFBA)26 ng/L | No federal limit | Reverse osmosis, or carbon certified for PFAS | NSF/ANSI 53 or 58, with PFBA named on the listing |
| Perfluoroheptanoic acid (PFHpA)31 ng/L | No federal limit | Reverse osmosis, or carbon certified for PFAS | NSF/ANSI 53 or 58, with PFHpA named on the listing |
Filters for the PFAS found in Fresno water
Affiliate linksPurityMap earns a commission from these links. "Best choice" and "Budget pick" go to certified products first; commission never decides them. As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure★ Best choice: Aquasana Claryum 2-Stage Under-Sink Filter (AQ-5200), certified for PFOA and PFOS.
| Pick | Product | Details and price | Certification | Why it’s listed | Link |
|---|---|---|---|---|---|
| ★ Best choice | Under-sinkAquasana Claryum 2-Stage Under-Sink Filter (AQ-5200) | TreatsPFOA and PFOSPrice$$ | Certified for PFOA and PFOS (NSF/ANSI 53, WQA) | Why it’s listed: its current certification names PFOA and PFOS, found in Fresno’s record.See the evidence | Check price on Amazon |
| Also good | Under-sinkAquasana Claryum 3-Stage Max Flow Under-Sink Filter (AQ-6300M) | TreatsPFOA and PFOSPrice$$ | Certified for PFOA and PFOS (NSF/ANSI 53, WQA) | Why it’s listed: its current certification names PFOA and PFOS, found in Fresno’s record.See the evidence | Check price at Aquasana |
| Also good | CountertopAquasana Clean Water Machine Countertop Filter (AQ-CWM2) | TreatsPFOA and PFOSPrice$$ | Certified for PFOA and PFOS (NSF/ANSI 53, WQA) | Why it’s listed: its current certification names PFOA and PFOS, found in Fresno’s record.See the evidence | Check price at Aquasana |
See all 12 drinking-water options for PFAS
| Pick | Product | Details and price | Certification | Why it’s listed | Link |
|---|---|---|---|---|---|
| Also good | Reverse osmosisSmartFlow® Reverse Osmosis | TreatsPFOA and PFOSTechnologyReverse osmosisPrice$$$ | Certified for PFOA and PFOS (NSF/ANSI 53 (includes P473), WQA) | Why it’s listed: its current certification names PFOA and PFOS, found in Fresno’s record.See the evidence | Check price at Aquasana |
| Also good | Under-sinkWaterdrop G3P600 Tankless Reverse-Osmosis System | TreatsPFOA and PFOSPrice$$$ | Certified for PFOA and PFOS (NSF/ANSI 53, IAPMO) | Why it’s listed: its current certification names PFOA and PFOS, found in Fresno’s record.See the evidence | Check price at Waterdrop |
| Also good | Under-sinkWaterdrop G3P800 Tankless Reverse-Osmosis System | TreatsPFOA and PFOSPrice$$$ | Certified for PFOA and PFOS (NSF/ANSI 53, IAPMO) | Why it’s listed: its current certification names PFOA and PFOS, found in Fresno’s record.See the evidence | Check price at Waterdrop |
| Also good | CountertopAquaTru Carafe Countertop Reverse-Osmosis Purifier (AT100) | TreatsPFOA and PFOSPrice$$$ | Certified for PFOA and PFOS (NSF/ANSI 53, IAPMO) | Why it’s listed: its current certification names PFOA and PFOS, found in Fresno’s record.See the evidence | Check price on Amazon |
| Also good | CountertopAquaTru Classic Countertop Reverse-Osmosis Purifier (AT2000) | TreatsPFOA and PFOSPrice$$$ | Certified for PFOA and PFOS (NSF/ANSI 53, IAPMO) | Why it’s listed: its current certification names PFOA and PFOS, found in Fresno’s record.See the evidence | Check price on Amazon |
| Also good | CountertopPatriot Pure Ultimate Water Filtration System | TreatsPFOA and PFOSPrice$$ | Certified for PFOA and PFOS (NSF/ANSI 53, NSF, IAPMO) | Why it’s listed: its current certification names PFOA and PFOS, found in Fresno’s record.See the evidence | Check price on Amazon |
| Also good | Reverse osmosisiSpring RCC7AK Alkaline Reverse Osmosis SystemUse code REFISPRING at checkout: 10% off your first iSpring order. | TechnologyReverse osmosisPrice$$ | Brand lab-tested for PFAS, not independently certified for PFHxS, PFOA, PFOS, Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA), Perfluorononanoic acid (PFNA), Perfluorobutanoic acid (PFBA), Perfluoroheptanoic acid (PFHpA), Perfluoropentanoic acid (PFPeA) and Perfluoropentanesulfonic acid (PFPeS) | See the evidence | Check price at iSpring |
| Also good | Reverse osmosisiSpring RO5004F Tankless Reverse Osmosis System with UVUse code REFISPRING at checkout: 10% off your first iSpring order. | TechnologyReverse osmosisPrice$$$ | Brand lab-tested for PFAS, not independently certified for PFHxS, PFOA, PFOS, Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA), Perfluorononanoic acid (PFNA), Perfluorobutanoic acid (PFBA), Perfluoroheptanoic acid (PFHpA), Perfluoropentanoic acid (PFPeA) and Perfluoropentanesulfonic acid (PFPeS) | See the evidence | Check price at iSpring |
| Also good | Reverse osmosisWaterdrop X12 Reverse Osmosis System | TechnologyReverse osmosisPrice$$$$ | Brand lab-tested for PFAS, not independently certified for PFHxS, PFOA, PFOS, Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA), Perfluorononanoic acid (PFNA), Perfluorobutanoic acid (PFBA), Perfluoroheptanoic acid (PFHpA), Perfluoropentanoic acid (PFPeA) and Perfluoropentanesulfonic acid (PFPeS) | See the evidence | Check price at Waterdrop |
★ Best choice: HealthShield™, certified for PFHxS, PFOA, PFOS, Perfluorononanoic acid (PFNA) and Perfluoroheptanoic acid (PFHpA).
| Pick | Product | Details and price | Certification | Why it’s listed | Link |
|---|---|---|---|---|---|
| ★ Best choice | Whole-houseHealthShield™ | TreatsPFHxS, PFOA, PFOS, Perfluorononanoic acid (PFNA) and Perfluoroheptanoic acid (PFHpA)Price$$$$ | Certified for PFHxS, PFOA, PFOS, Perfluorononanoic acid (PFNA) and Perfluoroheptanoic acid (PFHpA) (NSF/ANSI 53, WQA) | Why it’s listed: its current certification names PFHxS, PFOA, PFOS, Perfluorononanoic acid (PFNA) and Perfluoroheptanoic acid (PFHpA), found in Fresno’s record.See the evidence | Check price at Aquasana |
| $ Budget pick | Whole-houseiSpring WGB32B-PFKS PFAS & Heavy Metals Whole House FilterUse code REFISPRING at checkout: 10% off your first iSpring order. | Price$$$ | Brand lab-tested for PFAS, not independently certified for PFHxS, PFOA, PFOS, Perfluorobutanesulfonic acid (PFBS), Perfluorohexanoic acid (PFHxA), Perfluorononanoic acid (PFNA), Perfluorobutanoic acid (PFBA), Perfluoroheptanoic acid (PFHpA), Perfluoropentanoic acid (PFPeA) and Perfluoropentanesulfonic acid (PFPeS) | See the evidence | Check price at iSpring |
PurityMap earns a commission from these links. "Best choice" and "Budget pick" go to certified products first; commission never decides them. As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure.
Choose your situation
Older buildings may have lead service lines, solder or fixtures. Lead is not in Fresno’s published record, so only a tap test tells you. Test first-draw water, then filter if needed.
10 of 29 PFAS tested were detected in Fresno’s record (PFOS 30 ng/L, PFOA 16 ng/L and PFHxS 30 ng/L, and more); 3 above their limit. If PFAS matters to you, a filter certification names each compound it covers.
Most utilities keep chlorine or chloramine in the pipes. A carbon filter certified for taste and odor reduces either; your utility can tell you which it uses.
Your utility’s annual water quality report usually lists hardness; a test strip also measures it.
Reverse osmosis reduces many dissolved contaminants, including lead and minerals, at a single faucet, with some water sent to drain.
Fresno tap water FAQ
Get one email when Fresno’s record changes.
One email when a new sampling round is published, a result moves above or below its reference, or the system's score changes.Is Fresno tap water safe to drink?
PurityMap does not give a safe/unsafe verdict; it shows what the public records measured. For Fresno, PFOS 30 ng/L (limit 4 ng/L), PFOA 16 ng/L (limit 4 ng/L) and PFHxS 30 ng/L (limit 10 ng/L) were measured in one EPA sample each, above the limits EPA set in 2024 (not a violation: the limits are judged on a yearly average, due 2029). CITY OF FRESNO (PWSID CA1010007) has a Purity Score of 57/100 (confidence: moderate), assessed at the water-system level and computed only from contaminants that were measured. Water can change in your own pipes, so a certified test is the only way to know what comes out of your tap. What we found →
Who provides tap water in Fresno?
CITY OF FRESNO (PWS ID CA1010007) is the public water system on record for Fresno, California, serving about 545,970 people. Confirm the utility on your water bill before acting on a specific finding. Water utility →
Where does Fresno get its drinking water?
Surface water (primary source of record in EPA SDWIS). Water utility →
Are PFAS "forever chemicals" in Fresno's water?
Yes. In EPA's UCMR 5 testing (2023-03-01 to 2025-12-16), PFOS was measured at 30 ng/L in one EPA sample, above the 4 ng/L limit EPA set in 2024, PFOA was measured at 16 ng/L in one EPA sample, above the 4 ng/L limit EPA set in 2024 and PFHxS was measured at 30 ng/L in one EPA sample, above the 10 ng/L limit EPA set in 2024. EPA's 2024 limits are judged on a yearly average, and water systems have until 2029 to meet them, so a single sample is not a violation. PFBS (8.6 ng/L, below the 2,000 ng/L EPA health advisory), PFHxA (34 ng/L, below the 400,000 ng/L state limit) and PFNA (8 ng/L, below the 10 ng/L federal limit) were also detected. PFBA (26 ng/L), PFHpA (31 ng/L), PFPeA (47 ng/L) and PFPeS (5.3 ng/L) were also detected; they have no federal or state limit. Reverse osmosis and filters certified to NSF/ANSI 53 for PFOA/PFOS reduce them at the tap. What we found →
Is there lead in Fresno's tap water?
Lead is not in Fresno's current published record. Lead usually enters from a building's own pipes and fixtures, so a certified home test is the way to know yours. Your household →
What does the latest Fresno water report show?
PurityMap's current record for Fresno holds 31 findings: 3 above a reference, 3 detected within the reference, 4 detected with no limit and 21 not detected. Each finding links to its dated public record; a parameter that was never monitored is shown as pending, not as a pass. Records →
31 records, each traceable
- EPA UCMR 5
- EPA SDWIS (Lead & Copper Rule)
| Contaminant | Measured | Reference | Sampled | Source |
|---|---|---|---|---|
| Perfluorooctanesulfonic acid (PFOS) | 30 ng/L | 4.0 ng/L federal MCL (2024) | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorooctanoic acid (PFOA) | 16 ng/L | 4.0 ng/L federal MCL (2024) | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorohexanesulfonic acid (PFHxS) | 30 ng/L | 10 ng/L federal MCL (2024) | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorononanoic acid (PFNA) | 8 ng/L | 10 ng/L federal MCL (2024) | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorobutanesulfonic acid (PFBS) | 8.6 ng/L | 2,000 ng/L EPA health advisory (screening, not a legal limit) | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorohexanoic acid (PFHxA) | 34 ng/L | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorobutanoic acid (PFBA) | 26 ng/L | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoroheptanoic acid (PFHpA) | 31 ng/L | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoropentanesulfonic acid (PFPeS) | 5.3 ng/L | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoropentanoic acid (PFPeA) | 47 ng/L | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS) | < 5 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS) | < 5 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS) | < 5 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| 4,8-Dioxa-3H-perfluorononanoic acid (ADONA) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS) | < 2 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals) | < 5 ng/L (not detected) | 10 ng/L federal MCL (2024) | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Lead (90th percentile) | Not detected | 15 µg/L federal action level | 2023–2025 | EPA SDWIS (Lead & Copper Rule) ↗ (opens in a new tab) |
| Lithium | < 9 µg/L (not detected) | 10 µg/L EPA health reference level (screening, not a legal limit) | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA) | < 5 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA) | < 6 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Nonafluoro-3,6-dioxaheptanoic acid (NFDHA) | < 20 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoro-3-methoxypropanoic acid (PFMPA) | < 4 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoro-4-methoxybutanoic acid (PFMBA) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2025 | EPA UCMR 5 ↗ (opens in a new tab) |
UCMR5 Analytical Results
UCMR5 Analytical Results: CITY OF FRESNO (CA1010007)
US EPA
State SDWIS Compliance Record
Lead & Copper Rule 90th-percentile: CITY OF FRESNO (CA1010007)
US EPA SDWIS
Methodology: how we analyze water. Prepared with AI assistance and reviewed by the PurityMap Editorial Team before publication.
How PurityMap reads Fresno’s water
- 01Source data
EPA SDWIS, EPA UCMR 5 and utility reports, each dated and linked.
- 02Normalize
Units converted to one basis; a non-detect kept distinct from zero.
- 03Classify
Each result tagged by reference type: MCL, action level, screening level or aesthetic.
- 04Compare to the named reference
Every value sits against its own reference, never a blended one.
- 05Score
Measured subjects summarised at the water-system level; an open health-based violation caps the score.
- 06Match treatment
Treatment is matched to what was found; a product is called certified only when its current certification names it.
What the Purity Score means: a summary of this water system’s published record, capped while a health-based violation is open. It is not a test of any tap. CITY OF FRESNO · PWSID CA1010007 · Purity Score 57/100 (Fair) · Confidence: moderate · Assessed at the water-system level
Full methodology →Something off with your water's smell, color or taste?
Start with the hot-or-cold tap check. Where City of Fresno reported something related, it's shown below.
- Rotten-egg smell
- Cloudy or milky water
- Chlorine smell
- Brown or yellow water
- Metallic taste
Lead at City of Fresno: not detected (90th percentile, 2023–2025 monitoring period). Lead has no taste, so a taste neither shows nor rules it out.
ZIP codes in Fresno
A ZIP code is a postal area, not a water service area. Your water bill names your supplier.- 93650
- 93701
- 93702
- 93703
- 93704
- 93705
- 93706
- 93707
- 93708
- 93709
- 93710
- 93711
- 93712
- 93714
- 93715
- 93716
- 93717
- 93718
- 93720
- 93721
- 93722
- 93723
- 93724
- 93725