Tap Water Quality Report
Tap water quality in INDIO, California
Tap water in INDIO, California receives a grade of C (77/100) from TapWaterSafety.org. It's served by INDIO WATER AUTHORITY. 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. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in INDIO's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving INDIO.
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.
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.
Recommended filters for INDIO
Filters matched to the specific contaminants in INDIO's 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.
All contaminants detected in INDIO's tap water
Every contaminant identified, compared side-by-side against US EPA legal limits, the EU Drinking Water Directive (2020/2184), WHO Guidelines, and California's Public Health Goal. 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, California OEHHA PHGs, EWG Tap Water Database.
Treatment plant contact info
For service issues, water quality concerns, or to request a Consumer Confidence Report from INDIO WATER AUTHORITY.