Tap Water Quality Report
Tap water quality in Indianapolis, Indiana
Tap water in Indianapolis, Indiana receives a grade of C (75/100) from TapWaterSafety.org. It's served by CITIZENS WATER - INDIANAPOLIS. The most significant water quality concerns are: Haloacetic acids (HAA9) significantly above health guideline; Haloacetic acids (HAA5) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline; Arsenic detected. Data sources: EPA SDWIS, EPA ECHO, EWG Tap Water Database.
What's in Indianapolis's tap water
Top water quality concerns identified by the EPA and Environmental Working Group across the utility serving Indianapolis.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 33.3 ppb, 555x above the EWG health guideline of 0.06 ppb.
Haloacetic acids (HAA5) significantly above health guideline
Moderate concernHaloacetic acids (HAA5) detected at 38.6 ppb, 386x above the EWG health guideline of 0.1 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 51.7 ppb, 345x above the EWG health guideline of 0.15 ppb.
Arsenic detected
Moderate concernArsenic detected at 0.0358 ppb.
EPA compliance record
Official U.S. EPA records for CITIZENS WATER - INDIANAPOLIS (system ID IN5249004) for the last 3 years. Checked 2026-10-07.
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 Indianapolis
Filters matched to the specific contaminants in Indianapolis'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 Indianapolis'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 |
|---|---|---|---|---|---|---|---|---|
| Haloacetic acids (HAA9) Disinfection byproduct |
33.3 ppb | 0.06 | — | — | — | — | — | 555× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
38.6 ppb | 0.1 | 60.0 | 60 | — | — | — | 386× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
51.7 ppb | 0.15 | 80.0 | 100 | — | — | — | 345× over |
| Bromodichloromethane Disinfection byproduct |
8.1 ppb | 0.06 | — | — | — | — | — | 135× over |
| Chloroform Disinfection byproduct |
18.0 ppb | 0.4 | — | — | — | — | — | 45× over |
| Dibromochloromethane Disinfection byproduct |
2.7 ppb | 0.1 | — | — | — | — | — | 27× over |
| Radium, combined (-226 and -228) Radiological |
0.63 pCi/L | 0.05 | 5.0 | — | — | — | — | 13× over |
| Arsenic Heavy metal |
0.0358 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 8.9× over |
| Nitrate Inorganic |
0.627 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 4.5× over |
| Nitrate and nitrite Inorganic |
0.627 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 4.5× over |
| Chromium (hexavalent) Heavy metal |
0.08 ppb | 0.02 | — | — | — | — | — | 4.0× over |
| Chlorate Disinfection byproduct |
492.9 ppb | 210.0 | — | — | — | — | — | 2.3× over |
| Atrazine Pesticide/Herbicide |
0.193 ppb | 0.1 | 3.0 | 0.1 | 100 | 0.15 | — | Fails EU |
| 1,4-Dioxane Semi-volatile organic compound |
0.0738 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Bromoform Disinfection byproduct |
0.095 ppb | 0.5 | — | — | — | — | — | Below guideline |
| Barium Heavy metal |
129.9 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Simazine Pesticide/Herbicide |
0.0162 ppb | 0.1 | 4.0 | — | — | — | — | Below guideline |
| Molybdenum Other |
3.92 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Vanadium Other |
0.422 ppb | 21.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
0.495 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
2.31 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
1.48 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorobutanoic Acid (PFBA) PFAS |
0.412 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| 1,2,4-Trichlorobenzene Volatile organic compound |
0.00115 ppb | 5.0 | 70.0 | 1 | 10 | 0.15 | — | Below guideline |
| Perfluorobutane sulfonate (PFBS) PFAS |
0.419 ppt | 2000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.227 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Xylenes (total) Volatile organic compound |
0.00258 ppb | 1800.0 | 10000.0 | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.689 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 CITIZENS WATER - INDIANAPOLIS.
General Contact
Treatment Plant
ZIP codes served
Indianapolis's public water systems serve the following ZIP codes: