Screening: quick check, not lab-grade
WeAQUA DoubleCheck Water Hardness Test Strips (200)
WeAQUA
Total water hardness
- Turnaround: About 1 minute
What it can't tell you: It measures hardness only, so it tells you nothing about lead, PFAS or bacteria.
City water report · 2026
Is Fontana Tap Water Safe to Drink?
Short answer: In the 2022–2025 records we hold for Fontana, no listed result is above a legal limit. Also worth knowing: the water is hard. 1 substance was detected and 31 were tested and not detected. The water is from Fontana Water Company, serving 228,270 residents.
- Year 2026
- Utility Fontana Water Company
- Coverage 32 records
- Updated 2026-10-15
Water utility
Where Fontana’s water comes from
- Utility
- Fontana Water Company
- Water system
- SAN GABRIEL VALLEY WC - FONTANA · CA3610041
- Source water
- Surface water
- Disinfectant
- not on record
- Population served
- 228,270
- Reporting period
- Sampled 2022–2025
- Monitoring coverage
- 32 records · 3 of 4 groups measured
- Your water utility
- Fontana Water Company: contact and record
Likely match, check your bill
Your water bill or annual water quality report names your actual supplier.
- SAN GABRIEL VALLEY WC - FONTANAThis reportCA3610041 · 228,270 served
Why this matters
- 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.
At a glance
Fontana water in four numbers
Purity ScoreSAN GABRIEL VALLEY WC - FONTANA · PWSID CA3610041
1Detected1 above a reference
1Above a referenceof 32 records
0Health-based violationslast 10 years · EPA SDWIS
No measured result is above a legal limit; the water is hard.
What we found
One detected result
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.Water hardnessAbove aesthetic · Aesthetic, no health limitAesthetic, no federal health limit8.3gpg
① · Measured
8.3 gpg, sampled 2025. Utility CCR.
② · Compared
Aesthetic, no federal health limit.
③ · Meaning
134–151.35 mg/L as CaCO3 (7.8–8.9 grains/gal) across the system; hard at the midpoint (143 mg/L). Aesthetic (scale/appliances), not a health finding.
④ · Where it matters
Shows up as scale in kettles, water heaters and fixtures.
⑤ · What to do
See the evidence record →Test your own tap first. To reduce it: Ion-exchange water softener (NSF/ANSI 44 (softeners)).
31 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
- PFBS
- PFBA
- PFDA
- PFDoA
- PFHpS
- PFHpA
- PFHxS
- PFHxA
- PFNA
- PFOS
- PFOA
- PFPeS
- PFPeA
- PFTA
- PFTrDA
- PFUnA
SAN GABRIEL VALLEY WC - FONTANA (EPA PWSID CA3610041) delivers surface water to 228,270 residents. This report reflects 29 individual PFAS result(s) from the source UCMR5 observations and the latest Lead & Copper Rule 90th-percentile result. The utility's 2025 CCR reports hard water.
Track record
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.
Not in this recordDisinfection by-products weren't monitored in this dataset
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 household
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
Test first, then treat
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.
Commercial
Test kits
Affiliate linksAs an Amazon Associate, PurityMap earns from qualifying purchases.Screening tells you if something is worth a closer look; a lab result is the number you can act on.
As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure.
When your results arrive, read them here → · Compare every kit we list
Treatment matching
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 |
|---|---|---|---|
| Water hardness8.3 gpg | Aesthetic, no health limit | Ion-exchange water softener | NSF/ANSI 44 (softeners) |
Commercial
Softeners and scale reducers for Fontana's hard 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: GE GXSH35W Water Softener (35,000-grain), certified for hardness.
| Pick | Product | Details and price | Certification | Why it’s listed | Link |
|---|---|---|---|---|---|
| ★ Best choice | Water softenerGE GXSH35W Water Softener (35,000-grain) | TreatshardnessTechnologyIon exchangePrice$$$ | Certified for Hardness / scale (NSF/ANSI 44, IAPMO) | Why it’s listed: its current certification names hardness, found in Fontana’s record.See the evidence | Check price on Amazon |
| Also good | Water softenerKenmore 420 Water Softener (40,000-grain) | TreatshardnessTechnologyIon exchangePrice$$$ | Certified for Hardness / scale (NSF/ANSI 44, NSF) | Why it’s listed: its current certification names hardness, found in Fontana’s record.See the evidence | Check price on Amazon |
| Also good | Water softeneriSpring WCSTB45KG Whole House Water SoftenerUse code REFISPRING at checkout: 10% off your first iSpring order. | TechnologyIon exchangePrice$$$ | Brand lab-tested, not independently certified for hardness | See the evidence | Check price at iSpring |
See all 4 soft-water options for hardness
| Pick | Product | Details and price | Certification | Why it’s listed | Link |
|---|---|---|---|---|---|
| Also good | Water softenerWaterdrop WHR01 Water Softener | TechnologyIon exchangePrice$$$$ | Brand lab-tested, not independently certified for hardness | See the evidence | Check price at Waterdrop |
★ Best available: Salt-Free Water Conditioner, the best fit here; nothing in this group is certified yet.
| Pick | Product | Details and price | Certification | Why it’s listed | Link |
|---|---|---|---|---|---|
| ★ Best available | Salt-free conditionerSalt-Free Water Conditioner | Price$$$$ | Brand lab-tested, not independently certified for hardness | See the evidence | Check price at Aquasana |
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.
Local help
Tired of hard-water buildup?
A local plumber can look at your home and install a water softener or whole-home system.
Is this right for my home?
Choose your situation
Your path: I live in an older buildingLead from plumbing is the main question
Older buildings may have lead service lines, solder or fixtures. Lead is not in Fontana’s published record, so only a tap test tells you. Test first-draw water, then filter if needed.
Look forLead reduction: NSF/ANSI 53 (lead)
How to test your tap →Your path: I care about PFASCheck what was tested
None of the 29 PFAS tested was detected in Fontana’s record. If PFAS matters to you, a filter certification names each compound it covers.
Look forNSF/ANSI 53 or 58, with each compound you care about named on the listing
PFAS in Fontana →Your path: My water tastes of chlorineThe disinfectant is not in this record
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.
Look forNSF/ANSI 42 (chlorine taste and odor)
Water treatment technologies →Your path: I have scale or hard waterFontana water is hard (8.3 gpg)
Scale is a comfort and appliance issue, not a health one.
Look forSoftener: NSF/ANSI 44 (softeners)
Hard water in Fontana →Your path: I want the broadest reductionReverse osmosis at one tap
Reverse osmosis reduces many dissolved contaminants, including lead and minerals, at a single faucet, with some water sent to drain.
Look forNSF/ANSI 58
Compare treatments →Questions
Fontana tap water FAQ
Follow Fontana’s water
Get one email when Fontana’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 Fontana tap water safe to drink?
PurityMap does not give a safe/unsafe verdict; it shows what the public records measured. For Fontana, no regulated PFAS were detected in EPA's 2024 testing. SAN GABRIEL VALLEY WC - FONTANA (PWSID CA3610041) has a Purity Score of 100/100 (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 Fontana?
SAN GABRIEL VALLEY WC - FONTANA (PWS ID CA3610041) is the public water system on record for Fontana, California, serving about 228,270 people. Confirm the utility on your water bill before acting on a specific finding. Water utility →
Where does Fontana get its drinking water?
Surface water (primary source of record in EPA SDWIS). Water utility →
Are PFAS "forever chemicals" in Fontana's water?
None of the 29 PFAS in EPA's UCMR 5 testing (2023-06-05 to 2024-03-01) was detected. "Not detected" means below the lab's reporting limit, not proven zero. What we found →
Is there lead in Fontana's tap water?
Lead is not in Fontana'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 Fontana water report show?
PurityMap's current record for Fontana holds 32 findings: 1 above a reference and 31 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 →
Is Fontana's water hard?
Fontana's water is recorded as 8.3 gpg, hard. Hardness is an aesthetic and plumbing characteristic, not a health-based limit. Choose your situation →
Data and sources
32 records, each traceable
- EPA UCMR 5
- EPA SDWIS (Lead & Copper Rule)
- Utility CCR
| Contaminant | Measured | Reference | Sampled | Source |
|---|---|---|---|---|
| Water hardness | 8.3 gpg | Aesthetic, no federal health limit | 2025 | Utility CCR ↗ (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 | 2023–2024 | 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 | 2023–2024 | 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 | 2023–2024 | 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 | 2023–2024 | 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 | 2023–2024 | 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 | 2023–2024 | 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) | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Lead (90th percentile) | Not detected | 15 µg/L federal action level | 2022–2024 | 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) | 2023–2024 | 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 | 2023–2024 | 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 | 2023–2024 | 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 | 2023–2024 | 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 | 2023–2024 | 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 | 2023–2024 | 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 | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorobutanesulfonic acid (PFBS) | < 3 ng/L (not detected) | 2,000 ng/L EPA health advisory (screening, not a legal limit) | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorobutanoic acid (PFBA) | < 5 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorodecanoic acid (PFDA) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorododecanoic acid (PFDoA) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoroheptanesulfonic acid (PFHpS) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoroheptanoic acid (PFHpA) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorohexanesulfonic acid (PFHxS) | < 3 ng/L (not detected) | 10 ng/L federal MCL (2024) | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorohexanoic acid (PFHxA) | < 3 ng/L (not detected) | 400,000 ng/L Michigan EGLE state MCL (strictest US state) | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorononanoic acid (PFNA) | < 4 ng/L (not detected) | 10 ng/L federal MCL (2024) | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorooctanesulfonic acid (PFOS) | < 4 ng/L (not detected) | 4.0 ng/L federal MCL (2024) | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorooctanoic acid (PFOA) | < 4 ng/L (not detected) | 4.0 ng/L federal MCL (2024) | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoropentanesulfonic acid (PFPeS) | < 4 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoropentanoic acid (PFPeA) | < 3 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorotetradecanoic acid (PFTA) | < 8 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluorotridecanoic acid (PFTrDA) | < 7 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
| Perfluoroundecanoic acid (PFUnA) | < 2 ng/L (not detected) | No federal or state limit; shown for transparency | 2023–2024 | EPA UCMR 5 ↗ (opens in a new tab) |
UCMR5 Analytical Results
UCMR5 Analytical Results: SAN GABRIEL VALLEY WC - FONTANA (CA3610041)
US EPA
State SDWIS Compliance Record
Lead & Copper Rule 90th-percentile: SAN GABRIEL VALLEY WC - FONTANA (CA3610041)
US EPA SDWIS
Consumer Confidence Report (CCR)
Fontana Water Company (FWC) 2025 Consumer Confidence Report (CCR)
Fontana Water Company (FWC)
Methodology: how we analyze water. Prepared with AI assistance and reviewed by the PurityMap Editorial Team before publication.
Methodology
How PurityMap reads Fontana’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. SAN GABRIEL VALLEY WC - FONTANA · PWSID CA3610041 · Purity Score 100/100 (Excellent) · 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 Fontana Water Company reported something related, it's shown below.
- Rotten-egg smell
- Cloudy or milky water
- Chlorine smell
- Brown or yellow water
- Metallic taste
Lead at Fontana Water Company: not detected (90th percentile, 2022–2024 monitoring period). Lead has no taste, so a taste neither shows nor rules it out.