Water Quality Report · Updated May 12, 2026
RIALTO, CITY OF
RIALTO, CITY OF delivers tap water graded F (53/100) by TapWaterSafety.org. The utility serves approximately 54,453 residents in RIALTO, California using surface water (purchased). The most significant water quality concerns are: PFAS contamination; Perfluorohexane sulfonate (PFHXS) significantly above health guideline; Arsenic significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline. For questions, the utility can be reached at 909-820-2525.
Is RIALTO tap water safe to drink?
RIALTO, CITY OF delivers tap water that earns a grade of F (53/100) from TapWaterSafety.org — a poor rating, with significant contamination concerns and/or recent violations.
The utility serves 54,453 residents in RIALTO, drawing from surface water (purchased).
Public testing data identifies 15 contaminants in this water above EWG's health-based guidelines, including: Perfluorohexane sulfonate (PFHXS), Arsenic, Haloacetic acids (HAA5), Chromium (hexavalent), Haloacetic acids (HAA9), Nitrate, Perfluorooctanoic acid (PFOA), Nitrate and nitrite, Uranium, Total trihalomethanes (TTHMs), Tetrachloroethylene (perchloroethylene), Trichloroethylene, Bromodichloromethane, Dibromochloromethane, Dibromoacetic acid. For most residents, a properly certified home filter at the kitchen tap is the most cost-effective way to reduce exposure to whatever's in your water. See our filter recommendations below, matched specifically to this utility's contaminant profile.
Quick actions for RIALTO residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for RIALTO, CITY OF.
PFAS contamination
Severe concernPerfluorooctanoic acid (PFOA) detected. PFAS are persistent chemicals linked to cancer and immune effects with no known safe exposure threshold.
Perfluorohexane sulfonate (PFHXS) significantly above health guideline
Moderate concernPerfluorohexane sulfonate (PFHXS) detected at 0.919 ppt, 919x above the EWG health guideline of 0.001 ppt.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 2.52 ppb, 630x above the EWG health guideline of 0.004 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 36.2 ppb, 362x above the EWG health guideline of 0.1 ppb.
Contact RIALTO, CITY OF
Reach the utility directly for service issues, water quality concerns, or to request your Consumer Confidence Report.
General Contact
Treatment Plant
Recommended water filters for RIALTO
Filters matched to the specific contaminants in this water supply.
Reverse Osmosis or NSF P473 certified carbon
$80-$750Activated carbon and RO are the only technologies proven to remove PFAS at certified levels.
Reverse Osmosis
$249-$750Arsenic is most effectively removed by reverse osmosis. Some specialized adsorptive filters also work.
Carbon block (NSF/ANSI 42 + 53)
$40-$750Activated carbon is highly effective for disinfection byproducts like TTHM and HAA5.
Disclosure: TapWaterSafety earns a commission from purchases made through these links. This does not influence our scoring methodology or filter selection.
Score breakdown
This utility's overall score of 53/100 breaks down across five weighted components. Read the full methodology →
Contaminants detected — international standards comparison
Every contaminant detected, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal (the strictest US benchmark). Why we show multiple standards →
| Contaminant | Detected | EWG US health-based |
EPA US legal |
EU DWD Europe |
WHO global |
CA PHG strictest US |
Tested sample year |
Status |
|---|---|---|---|---|---|---|---|---|
| Perfluorohexane sulfonate (PFHXS) PFAS |
0.919 ppt | 0.001 | 10.0 | — | — | — | — | 919× over |
| Arsenic Heavy metal |
2.52 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 630× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
36.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 362× over |
| Chromium (hexavalent) Heavy metal |
1.12 ppb | 0.02 | — | — | — | — | — | 56× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
2.04 ppb | 0.06 | — | — | — | — | — | 34× over |
| Nitrate Inorganic |
3.53 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 25× over |
| Perfluorooctanoic acid (PFOA) PFAS |
1.87 ppt | 0.09 | 4.0 | 100 | 100 | 0.007 | — | 21× over |
| Nitrate and nitrite Inorganic |
2.2 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 16× over |
| Uranium Radiological |
2.9 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 6.7× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
0.831 ppb | 0.15 | 80.0 | 100 | — | — | — | 5.5× over |
| Tetrachloroethylene (perchloroethylene) Volatile organic compound |
0.3 ppb | 0.06 | 5.0 | — | — | — | — | 5.0× over |
| Trichloroethylene Volatile organic compound |
1.97 ppb | 0.4 | 5.0 | 10 | 20 | 1.7 | — | 4.9× over |
| Bromodichloromethane Disinfection byproduct |
0.246 ppb | 0.06 | — | — | — | — | — | 4.1× over |
| Dibromochloromethane Disinfection byproduct |
0.249 ppb | 0.1 | — | — | — | — | — | 2.5× over |
| Dibromoacetic acid Disinfection byproduct |
0.0333 ppb | 0.03 | — | — | — | — | — | 1.1× over |
| Chloroform Disinfection byproduct |
0.251 ppb | 0.4 | — | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
68.6 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
3.65 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Bromoform Disinfection byproduct |
0.0823 ppb | 0.5 | — | — | — | — | — | Below guideline |
| Dichloroacetic acid Disinfection byproduct |
0.025 ppb | 0.2 | — | — | — | — | — | Below guideline |
| 4,8-dioxa-3H-perfluorononanoic acid (ADONA) PFAS |
0.116 ppt | 1.0 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
2.78 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
2.77 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
2.92 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
1.68 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluoroheptanoic acid (PFHPA) PFAS |
1.07 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
1.59 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutanoic Acid (PFBA) PFAS |
0.589 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.316 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| 1,1-Dichloroethane Volatile organic compound |
0.000534 ppb | 3.0 | — | — | — | — | — | Below guideline |
| 1-Butanol Other |
0.111 ppb | — | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.256 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
All values in the unit of the detected level. Red cells indicate the detected level exceeds that standard. Some contaminants have limits in some jurisdictions but not others (shown as —). The "Tested" column shows the year each contaminant sample was collected.
Sources: US EPA, EU Drinking Water Directive 2020/2184, WHO Guidelines (4th ed.), California OEHHA PHGs, EWG Tap Water Database.
RIALTO, CITY OF service area
This water system serves 1 community in San Bernardino County, California. Click any city for its dedicated tap water quality page.
Find the right filter for RIALTO water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.