Hardness
Hard average153mg/L as CaCO₃
Vallejo service-area average; range 74–286
USGS hardness classes
About 8.9 grains per gallon. The Lakes service-area measurements are separate.
2025View source
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Solano County Water Quality Report
Showing utility report
City of Vallejo — Vallejo Service Area
2025 utility report; each result retains its measurement period
Results for City of Vallejo — Vallejo Service Area in Solano County. Confirm the supplier and system on your bill.
Your water at a glance
See the amount, the comparison and what it means. “Below” refers to the stated benchmark, not zero risk.
Chlorine
Reported level below MRDL1.03mg/L
Running annual average; range ND–2.94
MRDL: 4 mg/L
Match the filter to the disinfectant used by this utility.
2025View source
TTHMs
Reported level below benchmark65µg/L (ppb)
Running annual average; range 18–80
Report MCL: 80 µg/L
A system result does not measure the water at an individual home.
2025View source
HAA5
Reported level below benchmark25µg/L (ppb)
Running annual average; range 10–36
Report MCL: 60 µg/L
A system result does not measure the water at an individual home.
2025View source
Fluoride
Below report benchmark0.67mg/L
Vallejo service-area average; range 0.56–0.77
California MCL: 2 mg/L
Standard filtration and softening do not establish fluoride reduction.
2025View source
Lead
90th percentile below action levelNDµg/L (ppb)
All samples nondetect; 68 sampled sites
Report action level: 15 µg/L
No sampled sites exceeded the report’s action level. Nondetect is not a guarantee for every household tap.
2024View source
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The figures below are provider-specific. They are not a countywide average.
| Utility | Hardness | Hardness source |
|---|---|---|
| 153 mg/L · Hard average | 2025 |
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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.
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| What was measured | Reported amount | Sample year / source date | How to read it |
|---|---|---|---|
| Hardness | 153 mg/L as CaCO₃Vallejo service-area average; range 74–286 | 2025View source ↗ | Hard averageAbout 8.9 grains per gallon. The Lakes service-area measurements are separate. |
| Chlorine | 1.03 mg/LRunning annual average; range ND–2.94 | 2025View source ↗ | Reported level below MRDLMatch the filter to the disinfectant used by this utility. |
| TTHMs | 65 µg/L (ppb)Running annual average; range 18–80 | 2025View source ↗ | Reported level below benchmarkA system result does not measure the water at an individual home. |
| HAA5 | 25 µg/L (ppb)Running annual average; range 10–36 | 2025View source ↗ | Reported level below benchmarkA system result does not measure the water at an individual home. |
| Fluoride | 0.67 mg/LVallejo service-area average; range 0.56–0.77 | 2025View source ↗ | Below report benchmarkStandard filtration and softening do not establish fluoride reduction. |
| Lead | ND µg/L (ppb)All samples nondetect; 68 sampled sites | 2024View source ↗ | 90th percentile below action levelNo sampled sites exceeded the report’s action level. Nondetect is not a guarantee for every household tap. |
| Total dissolved solids | 202 mg/LVallejo service-area average; range 97–290 | 2025View source ↗ | Below report secondary benchmarkDissolved solids and hardness are different measurements. |
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 ↗
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Source water. Lake Berryessa supply through the Solano Project and State Water Project supply treated for the Vallejo service area.
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More about your local water
What this means for your home
The Vallejo service area averages 153 mg/L hardness. The separate Lakes service area has its own results.
This page uses the Vallejo service-area column, not the Lakes column. Fairfield, Vacaville, and other Solano County suppliers publish different reports. Confirm both the utility and service area on your account.
A useful local question
Are Vallejo and the Lakes service area the same water system?
The annual report separates them. This page summarizes the Vallejo service area. Use the Lakes column in the original report if that is your service area; the hardness and distribution results differ.
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.
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.
- City of Vallejo — Vallejo Service Area ↗2025 utility report; each result retains its measurement period
- USGS hardness classification
- EPA PFAS benchmarks and implementation
Sources checked November 15, 2026
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