Hardness
Very hard average197mg/L as CaCO₃
average · range 180–210
No drinking-water MCL
Calculated average: 11.5 gpg. USGS very hard: above 180 mg/L.
2025
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Your local water, explained
Riverside water quality report
A very hard groundwater blend: filtration and softening address different goals.
RPU reports average hardness of 197 mg/L as CaCO₃. That supports softening for scale control; contaminant-specific goals need an exact treatment match.
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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 25, 2026
Showing utility report
Riverside Public Utilities
2025 utility report; each result retains its sampling year
Only use these results if Riverside Public Utilities is the supplier on your bill. Other utilities and private wells need their own data.
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 4 mg/L MRDL0.58mg/L
average · range 0.25–0.85
MRDL 4.0 mg/L; MRDLG 4 mg/L
2025
View source ↗TTHM
Below MCL 80 µg/L6.1ppb
highest locational running annual average · range 1–7.6
MCL 80 µg/L
2025
View source ↗HAA5
Unknown; not zeroNot listedppb
Not listed in the detected-results table
Do not infer ND or zero.
2025 report review
View source ↗Fluoride
Below California 2 mg/L MCL0.45mg/L
average · range 0.39–0.53
California MCL 2 mg/L; PHG 1 mg/L
Naturally occurring; utility says it does not plan artificial addition.
2025
View source ↗Lead
Below 15 ppb action levelNDppb
90th percentile; 51 household samples · range ND
AL 15 µg/L; PHG 0.2 µg/L
Zero samples exceeded AL; individual homes can differ.
2025
View source ↗Arsenic
Below MCL 10 µg/L3.3ppb
average · range ND–4.6
MCL 10 µg/L; PHG 0.004 µg/L
2025
View source ↗PFAS
Review sampling scopeDetected
2023 UCMR5 results
See compound-specific results and dates in the expanded table. These are not home tests.
2023
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 | 197 mg/L as CaCO₃average · range 180–210 | 2025View source ↗ | Very hard averageCalculated average: 11.5 gpg. USGS very hard: above 180 mg/L. |
| Chlorine | 0.58 mg/Laverage · range 0.25–0.85 | 2025View source ↗ | Below 4 mg/L MRDL |
| TTHM | 6.1 ppbhighest locational running annual average · range 1–7.6 | 2025View source ↗ | Below MCL 80 µg/L |
| HAA5 | Not listed ppbNot listed in the detected-results table | 2025 report reviewView source ↗ | Unknown; not zeroDo not infer ND or zero. |
| Fluoride | 0.45 mg/Laverage · range 0.39–0.53 | 2025View source ↗ | Below California 2 mg/L MCLNaturally occurring; utility says it does not plan artificial addition. |
| Nitrate as nitrogen | 5.4 mg/Laverage · range 4.7–6.5 | 2025View source ↗ | Below MCL and PHG 10 mg/L |
| Arsenic | 3.3 ppbaverage · range ND–4.6 | 2025View source ↗ | Below MCL 10 µg/L |
| Hexavalent chromium | 2.1 ppbaverage · range 2.0–2.2 | 2025View source ↗ | Below California MCL 10 µg/L |
| Perchlorate | 2.3 ppbaverage · range ND–3.2 | 2025View source ↗ | Below MCL 6 µg/L |
| Uranium | 6.1 pCi/Laverage · range 4.7–9.9 | 2025View source ↗ | Below MCL 20 pCi/L |
| Lead | ND ppb90th percentile; 51 household samples · range ND | 2025View source ↗ | Below 15 ppb action levelZero samples exceeded AL; individual homes can differ. |
| Copper | 0.47 mg/L90th percentile; 51 household samples · range ND–0.8 | 2025View source ↗ | Below 1.3 mg/L action levelZero samples exceeded AL. |
| Total dissolved solids | 357 mg/Laverage · range 320–380 | 2025View source ↗ | Below 1,000 mg/L secondary MCLAesthetic benchmark; TDS is not hardness. |
| pH | 8 pH unitsaverage · range 7.4–8.1 | 2025View source ↗ | Descriptive water chemistry |
| PFHxA | 3.6 pptaverage · range ND–4.3 | 2023 UCMR5 data in 2025 reportView source ↗ | Historical PFAS result2023 UCMR5 data, not a 2025 measurement. Notification level 1000 ng/L |
| PFPeA | 6.3 pptaverage · range 5.6–8.7 | 2023 UCMR5 data in 2025 reportView source ↗ | Historical PFAS result2023 UCMR5 data, not a 2025 measurement. No standard listed |
| PFBA | ND pptaverage · range ND–5.6 | 2023 UCMR5 data in 2025 reportView source ↗ | Historical PFAS result2023 UCMR5 data, not a 2025 measurement. No standard listed |
| PFAS | Detected 2023 UCMR5 results | 2023View source ↗ | Review sampling scopeSee compound-specific results and dates in the expanded table. These are not home tests. |
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 from Bunker Hill and Riverside basins; sources blended centrally before distribution.
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.
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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
Riverside County stretches beyond the City of Riverside service area. RPU’s groundwater blend does not describe every district, desert community or private well in the county.
A useful local question
Does Riverside’s report cover every home in Riverside County?
No. These results are for Riverside Public Utilities. Eastern Municipal Water District, Western Water and other suppliers publish separate reports; private wells need current tests.
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.
- Riverside Public Utilities ↗2025 utility report; each result retains its sampling year
- USGS hardness classification
- EPA PFAS benchmarks and implementation
Sources checked October 25, 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.
Your homeFind my system →