Hardness
Hard average129mg/L as CaCO₃
average; range 87–150
USGS hardness classes
About 7.5 gpg. The reported range includes moderately hard and hard water; confirm your home’s current level.
2025
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Your local water, explained
Fresno County Water Quality Report
City of Fresno results are a starting point, not one report for every county water system.
The City of Fresno’s 2025 report shows an average hardness of 129 mg/L, in the hard category. For homes on that supply, filtration plus softening is a sensible starting recommendation for chlorine and scale goals. Other county utilities and private wells need their own data.
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Your water
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These are utility measurements, not a test at your tap or a current service advisory. Sources checked October 27, 2026
Choose the right utility report
The figures below are provider-specific. They are not a countywide average.
| Utility | Hardness | Hardness source |
|---|---|---|
| 129 mg/L as CaCO₃ · Hard average | 2025 · average; range 87–150 |
Showing utility report
City of Fresno Water Division
2025 utility report; measurement years are shown with each result
Use these results only if City of Fresno Water Division supplies your home. County and ZIP boundaries do not confirm a water provider.
Your water at a glance
See the amount, the comparison and what it means. “Below” refers to the stated benchmark, not zero risk.
Chlorine
Below the 4 mg/L limit1.45mg/L
average; range 0.02–1.85
MRDL: 4 mg/L
Listed as chlorine (NaOCl) in the utility report. Select filtration for the disinfectant and desired flow.
2025
View source ↗TTHMs
Reported value below 80 ppb0.18µg/L (ppb)
reported average; range ND–4.3
MCL: 80 ppb
This average is transcribed from the report; it is not a household measurement.
2025
View source ↗HAA5
Reported value below 60 ppb4.30µg/L (ppb)
reported average; range ND–9.7
MCL: 60 ppb
Disinfection byproducts; use the report’s averaging and sampling context.
2025
View source ↗Fluoride
Below California’s 2 mg/L limit0.12mg/L
average; range 0.10–0.13
California MCL: 2 mg/L
A low reported result is not zero; fluoride reduction requires dedicated treatment.
2025
View source ↗Lead
Below the report’s action levelND90th percentile
53 sampled homes
Report action level: 15 ppb
No samples exceeded 15 ppb. A current tap test is needed to assess your own plumbing.
August 2025
View source ↗Arsenic
Below the 10 ppb limit3.15µg/L (ppb)
average; range ND–5.1
MCL: 10 ppb
The report’s 0.004 ppb health goal is much lower than the legal limit. Below MCL does not mean zero.
2025
View source ↗PFAS
Some source results above notification levelsDetectedsource-well monitoring
some affected wells removed from service
Compound-specific results
PFOA, PFOS and PFHxS were detected. Use the detailed utility results and current supply information before selecting treatment.
2025
View source ↗View Full Water ReportOpen the measured results, dates, comparisons and original utility report.
The numbers behind your report
Selected results with the original sampling dates and measurement basis. Open the utility report for every parameter, notice and footnote.
Open the complete utility report ↗
| What was measured | Reported amount | Sample year / source date | How to read it |
|---|---|---|---|
| Hardness | 129 mg/L as CaCO₃average; range 87–150 | 2025View source ↗ | Hard averageAbout 7.5 gpg. The reported range includes moderately hard and hard water; confirm your home’s current level. |
| Chlorine | 1.45 mg/Laverage; range 0.02–1.85 | 2025View source ↗ | Below the 4 mg/L limitListed as chlorine (NaOCl) in the utility report. Select filtration for the disinfectant and desired flow. |
| TTHMs | 0.18 µg/L (ppb)reported average; range ND–4.3 | 2025View source ↗ | Reported value below 80 ppbThis average is transcribed from the report; it is not a household measurement. |
| HAA5 | 4.30 µg/L (ppb)reported average; range ND–9.7 | 2025View source ↗ | Reported value below 60 ppbDisinfection byproducts; use the report’s averaging and sampling context. |
| Fluoride | 0.12 mg/Laverage; range 0.10–0.13 | 2025View source ↗ | Below California’s 2 mg/L limitA low reported result is not zero; fluoride reduction requires dedicated treatment. |
| Lead | ND 90th percentile53 sampled homes | August 2025View source ↗ | Below the report’s action levelNo samples exceeded 15 ppb. A current tap test is needed to assess your own plumbing. |
| Arsenic | 3.15 µg/L (ppb)average; range ND–5.1 | 2025View source ↗ | Below the 10 ppb limitThe report’s 0.004 ppb health goal is much lower than the legal limit. Below MCL does not mean zero. |
| PFAS | Detected source-well monitoringsome affected wells removed from service | 2025View source ↗ | Some source results above notification levelsPFOA, PFOS and PFHxS were detected. Use the detailed utility results and current supply information before selecting treatment. |
| Nitrate as nitrogen | 4.80 mg/Laverage; reported range ND–12 | 2025View source ↗ | Average below 10; high sample investigatedThe utility attributes the high Well 85 result to lab error after confirmation testing. Do not present 12 mg/L as a confirmed citywide level. |
| Chromium-6 | 2.50 µg/Laverage; range 0.1–9.6 | 2025View source ↗ | Below the 10 µg/L limitThe report’s 0.02 µg/L health goal is different from the MCL. |
| Copper | 0.18 mg/L90th percentile | August 2025View source ↗ | Below the 1.3 mg/L action levelNo sampled homes exceeded the action level. |
| Tetrachloroethylene (PCE) | 0.07 µg/Laverage; range ND–1.9 | 2025View source ↗ | Below the 5 µg/L limitTreatment claims must name the exact contaminant and model. |
| Trichloroethylene (TCE) | 0.32 µg/Laverage; range ND–2.3 | 2025View source ↗ | Below the 5 µg/L limitA system average cannot identify the value at a particular home. |
| PFOA | 1.33 ng/L (ppt)average; source range ND–13 | 2025View source ↗ | Some samples above the report’s 4 ppt notification levelThe report describes affected wells removed from service. Notification levels are not MCLs. |
| PFOS | 1.58 ng/L (ppt)average; source range ND–24 | 2025View source ↗ | Some samples above the report’s 4 ppt notification levelThese source-well maxima do not establish a tap concentration. |
| PFHxS | 0.91 ng/L (ppt)average; source range ND–38 | 2025View source ↗ | Some samples above the report’s 3 ppt notification levelThe report includes well shutdowns; confirm current supply and compound-specific treatment. |
| PFBS | 0.46 ng/L (ppt)average; source range ND–7 | 2025View source ↗ | Below the report’s 500 ppt notification levelNotification levels and federal MCLs are different types of benchmarks. |
| Total dissolved solids | 186.8 mg/Laverage; range 87–260 | 2025View source ↗ | Below report’s 1,000 mg/L secondary limitTDS does not establish whether a specific contaminant is present. |
In drinking water, ppm ≈ mg/L, ppb ≈ µg/L and ppt ≈ ng/L. Calculated hardness in grains per US gallon (gpg) = mg/L as CaCO₃ ÷ 17.118, rounded to one decimal. ND means below the reporting limit, not zero.
MCL is an enforceable contaminant limit; MRDL is a disinfectant limit. A PHG is a health goal, not the legal limit. Lead/copper action levels use system sampling percentiles, not a safe-tap threshold. TTHM/HAA5 comparisons use locational running annual averages.
PFAS results are compound-specific. Source monitoring, entry-point samples and tap tests are different. Notification and response levels in a utility report are not maximum contaminant levels; do not infer a compliance violation from a single value. EPA PFAS benchmarks and implementation ↗
Turn your report into a plan for your home.
Choose the system size, keep useful existing equipment, and review your filtration goals.
Source water. Groundwater wells and treated surface water associated with the Kings and San Joaquin rivers. Supply blends vary across the city.
Your provider needs its own report.
Continue with your home details for general filtration guidance. We will not use another utility’s numbers as your result.
Find My Water System →Private well? Start with a current water test.
A city report cannot establish a well’s water quality. Well-water treatment depends on your test results and site conditions.
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More about your local water
What this means for your home
Fresno County contains many separate water systems. This guide’s numerical results are from the City of Fresno; they should not be assigned to Clovis, another city or a private well. The original report also documents source-well investigations and shutdowns, which must stay attached to the contaminant figures. For a well, arrange current laboratory testing before selecting treatment.
Related city reports
Different name on your water bill?
These local providers publish separate reports. Follow the matching utility link; the measurements above do not describe these systems.
A useful local question
Should every Fresno County home use the same water treatment?
No. City of Fresno’s hard-water average supports recommending a softener for customers with scale concerns, paired with appropriate filtration. A home on another utility or a well may have different hardness, nitrate or other treatment needs. Confirm the supplier and use source-specific results before sizing or ordering.
Sources and methodology
We keep each utility’s results separate, show the reported sample year, and distinguish averages, maxima and tap-sampling percentiles. Hardness classifications use USGS ranges. Missing data stays unknown.
- City of Fresno Water Division ↗2025 utility report; measurement years are shown with each result
- Fresno water quality and testing ↗
- USGS hardness classification
- EPA PFAS benchmarks and implementation
Sources checked October 27, 2026
Your water → your home → your system
Turn your report into a plan for your home.
Choose the system size, keep useful existing equipment, and review your filtration goals.
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