Hardness
Very hard average271mg/L as CaCO₃
Groundwater average; range 107–561
USGS hardness classes
About 15.8 grains per gallon. Use a current incoming-water test for final softener sizing.
2024–2025View source
- 1Your water
- 2Your home
- 3Your system
Monterey County Water Quality Report
Showing utility report
Cal Water — Salinas System
2025 utility report; each result retains its measurement period
Results for Cal Water — Salinas System in Monterey 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 MRDL0.99mg/L
Distribution average; range 0.41–1.7
MRDL: 4 mg/L
Match the filter to the disinfectant used by this utility.
2025View source
TTHMs
Reported level below benchmark10.0µg/L (ppb)
Highest annual average; range ND–11
Report MCL: 80 µg/L
A system result does not measure the water at an individual home.
2025View source
HAA5
Reported level below benchmark1.1µg/L (ppb)
Highest annual average; range ND–2.1
Report MCL: 60 µg/L
A system result does not measure the water at an individual home.
2025View source
Fluoride
Below report benchmark0.26mg/L
Groundwater average; range 0.17–0.41
California MCL: 2 mg/L
Standard filtration and softening do not establish fluoride reduction.
2023–2025View source
Lead
90th percentile below action levelNDµg/L (ppb)
90th percentile; 51 sampled sites
Report action level: 15 µg/L
One sampled site exceeded 15 µg/L. Nondetect at the 90th percentile does not describe every tap.
2025View source
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Explore well-water systems →Water hardness by provider
The figures below are provider-specific. They are not a countywide average.
| Utility | Hardness | Hardness source |
|---|---|---|
| 271 mg/L · Very hard average | 2024–2025 |
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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 | 271 mg/L as CaCO₃Groundwater average; range 107–561 | 2024–2025View source ↗ | Very hard averageAbout 15.8 grains per gallon. Use a current incoming-water test for final softener sizing. |
| Chlorine | 0.99 mg/LDistribution average; range 0.41–1.7 | 2025View source ↗ | Reported level below MRDLMatch the filter to the disinfectant used by this utility. |
| TTHMs | 10.0 µg/L (ppb)Highest annual average; range ND–11 | 2025View source ↗ | Reported level below benchmarkA system result does not measure the water at an individual home. |
| HAA5 | 1.1 µg/L (ppb)Highest annual average; range ND–2.1 | 2025View source ↗ | Reported level below benchmarkA system result does not measure the water at an individual home. |
| Fluoride | 0.26 mg/LGroundwater average; range 0.17–0.41 | 2023–2025View source ↗ | Below report benchmarkStandard filtration and softening do not establish fluoride reduction. |
| Lead | ND µg/L (ppb)90th percentile; 51 sampled sites | 2025View source ↗ | 90th percentile below action levelOne sampled site exceeded 15 µg/L. Nondetect at the 90th percentile does not describe every tap. |
| Nitrate as nitrogen | 3.3 mg/LGroundwater average; range 0.53–7.1 | 2025View source ↗ | Reported average below benchmarkNitrate requires treatment selected for that specific contaminant. |
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. Groundwater sources serving Cal Water’s Salinas System.
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What this means for your home
The Salinas System’s hardness averages 271 mg/L, with a source range of 107–561 mg/L.
This page uses Cal Water’s Salinas System report. The Monterey Peninsula and other Monterey County communities have different suppliers and water conditions. Confirm the precise system name, including whether your account belongs to another Cal Water system.
A useful local question
Does the Salinas report describe water on the Monterey Peninsula?
No. These measurements belong to Cal Water’s Salinas System. A county boundary is not a water-service boundary; use the supplier and system shown on your bill to locate the right report.
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.
- Cal Water — Salinas System ↗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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