Riverside Highland Water Company Water Quality (California) – 2025 Report Results

We read 13 results from Riverside Highland Water Company’s 2025 water quality report. No results over a legal limit; 3 above a health goal or guideline.

Serves about 20,188 people · Water system ID CA3610057 · Read the district’s 2025 report (opens in a new tab)

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Results from the 2025 report

Each number is copied from the district’s report and links to the page it’s printed on. Where the report lists several plants, wells or purchased water, the highest is shown.

Contaminant	Result	Health goal	Legal limit	What it means
Arsenicaverage · range ND to 2.1 · RHWC wells · 2025 report, page 5	1.47 ppb	0.004 ppb	10 ppb	Above the health goal368x the health goal
Chromium-6average · range ND to 1.7 · RHWC wells · 2025 report, page 5	0.9 ppb	0.02 ppb	10 ppb	Above the health goal45x the health goal
Gross alpha (radioactivity)average · range ND to 5.24 · RHWC wells · 2025 report, page 5	2.62 pCi/L	0 pCi/L	15 pCi/L	Above the health goalThe health goal is zero
Chlorideaverage · range 4.8 to 45 · RHWC wells · 2025 report, page 5	21.9 ppm	—	250 ppm guideline	Within the guideline
Chlorinehighest running annual average · range 1.04 to 1.19 · Distribution system · 2025 report, page 5	1.11 ppm	None set	4 ppm	Below the legal limit
Chromium (total)average · range ND to 1.8 · RHWC wells · 2025 report, page 5	0.93 ppb	None set	100 ppb	Below the legal limit
Disinfection byproducts (TTHM)highest running annual average · range ND to 9.2 · Distribution system · 2025 report, page 5	2.32 ppb	None set	80 ppb	Below the legal limit
Fluorideaverage · range 0.19 to 0.54 · RHWC wells · 2025 report, page 5	0.3 ppm	1 ppm	2 ppm	Below the health goal
Nitrate (as N)average · range 1.3 to 5.5 · RHWC wells · 2025 report, page 5	3.23 ppm	10 ppm	10 ppm	Below the health goal
Sulfateaverage · range 21 to 85 · RHWC wells · 2025 report, page 5	46 ppm	—	250 ppm guideline	Within the guideline
Total dissolved solidsaverage · range 170 to 520 · RHWC wells · 2025 report, page 5	317 ppm	—	500 ppm guideline	Within the guideline
Turbidity (cloudiness)average · range ND to 0.2 · RHWC wells · 2025 report, page 5	0.13 NTU	None set	1 NTU	Below the legal limit
Conductivityaverage · range 340 to 830 · RHWC wells · 2025 report, page 5	503 µS/cm	None set	None	No health limit

Utility results describe the whole system, measured where water enters the pipes, not your tap. Your home’s plumbing can add lead or copper. 2 numbers we weren’t sure about are held back until a person checks.

EPA testing for PFAS and lithium

EPA’s own nationwide testing (UCMR 5) found these in Riverside Highland Water Company’s water between Jul 2024 and Jan 2025. These are EPA lab results, separate from the district’s report. Anything not listed was not detected.

PFOA18 pptFound in 2 of 6 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
PFOS19 pptFound in 2 of 6 samples · highest resultAbove the federal limit that takes effect in 2029 (4 ppt)
PFHxS14 pptFound in 4 of 6 samples · highest resultNo federal limit in force for this one
PFBS13 pptFound in 3 of 6 samples · highest resultNo federal limit in force for this one
Lithium11 ppbFound in 3 of 6 samples · highest resultAbove EPA’s health reference level of 10 ppb (a guide, not a legal limit)

Source: EPA UCMR 5 occurrence data. The highest single result is shown; one high sample doesn’t mean every glass is that high.

What you can do

Nothing here is an emergency notice: if the district has a violation, it must tell customers directly. If you’d like to lower these at your tap, these are the treatments that remove them, and the catalog shows the models certified for each. Ranking is by certified removal; commissions never change the order.