Water Quality Report · Updated October 07, 2026
INDIO WATER AUTHORITY
INDIO WATER AUTHORITY delivers tap water graded B (77/100) by TapWaterSafety.org. The utility serves approximately 84,757 residents in INDIO, California using groundwater. The most significant water quality concerns are: Chromium (hexavalent) significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline; Nitrate significantly above health guideline; Arsenic detected. For questions, the utility can be reached at 760-625-1852.
Is INDIO tap water safe to drink?
INDIO WATER AUTHORITY delivers tap water that earns a grade of B (77/100) from TapWaterSafety.org — a good rating, with only minor concerns relative to health-based guidelines.
The utility serves 84,757 residents in INDIO, drawing from groundwater.
Public testing data identifies 10 contaminants in this water above EWG's health-based guidelines, including: Chromium (hexavalent), Haloacetic acids (HAA5), Nitrate, Arsenic, Nitrate and nitrite, Uranium, Total trihalomethanes (TTHMs), Haloacetic acids (HAA9), Dibromochloromethane, Bromodichloromethane. 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.
EPA compliance record
Official U.S. EPA records for INDIO WATER AUTHORITY (system ID CA3310020) for the last 3 years. Checked 2026-10-07.
| Rule | Type | Since | Status |
|---|---|---|---|
| Nitrate Rule | Missed testing or reporting | 07/01/2024 | Open |
Source: U.S. EPA Enforcement and Compliance History Online (ECHO), from the Safe Drinking Water Information System. See EPA's full report.
Quick actions for INDIO residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for INDIO WATER AUTHORITY.
Chromium (hexavalent) significantly above health guideline
Moderate concernChromium (hexavalent) detected at 8.14 ppb, 407x above the EWG health guideline of 0.02 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.
Nitrate significantly above health guideline
Moderate concernNitrate detected at 2.59 ppm, 19x above the EWG health guideline of 0.14 ppm.
Arsenic detected
Moderate concernArsenic detected at 0.0737 ppb.
Contact INDIO WATER AUTHORITY
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 INDIO
Filters matched to the specific contaminants in this water supply.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
Reverse osmosis certified for arsenic (NSF/ANSI 58)
$429-$599Reverse osmosis certified under NSF/ANSI 58 for arsenic is the most reliable home option.
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 77/100 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 |
|---|---|---|---|---|---|---|---|---|
| Chromium (hexavalent) Heavy metal |
8.14 ppb | 0.02 | — | — | — | — | — | 407× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
36.2 ppb | 0.1 | 60.0 | 60 | — | — | — | 362× over |
| Nitrate Inorganic |
2.59 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 19× over |
| Arsenic Heavy metal |
0.0737 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 18× over |
| Nitrate and nitrite Inorganic |
1.42 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 10× over |
| Uranium Radiological |
3.59 pCi/L | 0.43 | 20.0 | 30 | 30 | 0.43 | — | 8.3× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
0.772 ppb | 0.15 | 80.0 | 100 | — | — | — | 5.1× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
0.207 ppb | 0.06 | — | — | — | — | — | 3.4× over |
| Dibromochloromethane Disinfection byproduct |
0.207 ppb | 0.1 | — | — | — | — | — | 2.1× over |
| Bromodichloromethane Disinfection byproduct |
0.0884 ppb | 0.06 | — | — | — | — | — | 1.5× over |
| Vanadium Other |
15.3 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Chlorate Disinfection byproduct |
133.9 ppb | 210.0 | — | — | — | — | — | Below guideline |
| Bromoform Disinfection byproduct |
0.282 ppb | 0.5 | — | — | — | — | — | Below guideline |
| Molybdenum Other |
12.0 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Chloroform Disinfection byproduct |
0.0273 ppb | 0.4 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
2.51 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Barium Heavy metal |
7.32 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Aluminum Heavy metal |
2.79 ppb | 600.0 | — | 200 | — | 600 | — | Below guideline |
| Strontium Radiological |
0.3 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Chromium (total) Heavy metal |
10.6 ppb | — | 100.0 | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.543 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.
INDIO WATER AUTHORITY service area
This water system serves 1 community in Riverside County, California. Click any city for its dedicated tap water quality page.
Find the right filter for INDIO water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.