Water Quality Report · Updated October 07, 2026
INDIANA AMERICAN WATER - JOHNSON COUNTY
INDIANA AMERICAN WATER - JOHNSON COUNTY delivers tap water graded A (85/100) by TapWaterSafety.org. The utility serves approximately 86,813 residents in GREENWOOD, Indiana using groundwater. The most significant water quality concerns are: Arsenic significantly above health guideline; Haloacetic acids (HAA9) significantly above health guideline; Total trihalomethanes (TTHMs) significantly above health guideline. For questions, the utility can be reached at 317-885-2408.
Is GREENWOOD tap water safe to drink?
INDIANA AMERICAN WATER - JOHNSON COUNTY delivers tap water that earns a grade of A (85/100) from TapWaterSafety.org — an excellent rating reflecting minimal contamination and full compliance with health guidelines.
The utility serves 86,813 residents in GREENWOOD, drawing from groundwater.
Public testing data identifies 8 contaminants in this water above EWG's health-based guidelines, including: Arsenic, Haloacetic acids (HAA9), Total trihalomethanes (TTHMs), Haloacetic acids (HAA5), Radium, combined (-226 and -228), Nitrate, Nitrate and nitrite, Chlorate. 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 INDIANA AMERICAN WATER - JOHNSON COUNTY (system ID IN5241005) 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.
Quick actions for GREENWOOD residents
Top concerns in this water
Based on the most recent EPA and EWG data, these are the most significant water quality issues for INDIANA AMERICAN WATER - JOHNSON COUNTY.
Arsenic significantly above health guideline
Moderate concernArsenic detected at 0.667 ppb, 167x above the EWG health guideline of 0.004 ppb.
Haloacetic acids (HAA9) significantly above health guideline
Moderate concernHaloacetic acids (HAA9) detected at 9.67 ppb, 161x above the EWG health guideline of 0.06 ppb.
Total trihalomethanes (TTHMs) significantly above health guideline
Moderate concernTotal trihalomethanes (TTHMs) detected at 15.8 ppb, 105x above the EWG health guideline of 0.15 ppb.
Contact INDIANA AMERICAN WATER - JOHNSON COUNTY
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 GREENWOOD
Filters matched to the specific contaminants in this water supply.
Reverse osmosis certified for arsenic (NSF/ANSI 58)
$429-$599Reverse osmosis certified under NSF/ANSI 58 for arsenic is the most reliable home option.
Carbon filter certified for VOCs (NSF/ANSI 53)
$180-$599Activated carbon is effective for disinfection byproducts. Look for NSF/ANSI 53 VOC reduction.
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 85/100 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 |
|---|---|---|---|---|---|---|---|---|
| Arsenic Heavy metal |
0.667 ppb | 0.004 | 10.0 | 10 | 10 | 0.004 | — | 167× over |
| Haloacetic acids (HAA9) Disinfection byproduct |
9.67 ppb | 0.06 | — | — | — | — | — | 161× over |
| Total trihalomethanes (TTHMs) Disinfection byproduct |
15.8 ppb | 0.15 | 80.0 | 100 | — | — | — | 105× over |
| Haloacetic acids (HAA5) Disinfection byproduct |
6.77 ppb | 0.1 | 60.0 | 60 | — | — | — | 68× over |
| Radium, combined (-226 and -228) Radiological |
0.86 pCi/L | 0.05 | 5.0 | — | — | — | — | 17× over |
| Nitrate Inorganic |
0.156 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 1.1× over |
| Nitrate and nitrite Inorganic |
0.156 ppm | 0.14 | 10.0 | 11.3 | 11.3 | 10 | — | 1.1× over |
| Chlorate Disinfection byproduct |
210.8 ppb | 210.0 | — | — | — | — | — | 1.0× over |
| Barium Heavy metal |
266.7 ppb | 700.0 | 2000.0 | — | 1300 | 2000 | — | Below guideline |
| Molybdenum Other |
8.76 ppb | 40.0 | — | — | — | — | — | Below guideline |
| Manganese Heavy metal |
16.4 ppb | 100.0 | — | 50 | 80 | — | — | Below guideline |
| 1,4-Dioxane Semi-volatile organic compound |
0.0567 ppb | 0.35 | — | — | 50 | 1 | — | Below guideline |
| Perfluoropentanoic Acid (PFPeA) PFAS |
1.55 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Perfluorohexanoic Acid (PFHxA) PFAS |
1.4 ppt | 1000.0 | — | — | — | — | — | Below guideline |
| Strontium Radiological |
0.675 ppb | 1500.0 | — | — | — | — | — | Below guideline |
| Fluoride Inorganic |
0.557 ppm | — | 4.0 | 1.5 | 1.5 | — | — | Below guideline |
| Germanium Other |
0.118 ppb | — | — | — | — | — | — | Below guideline |
| Lithium Other |
3.18 ppb | — | — | — | — | — | — | 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.
INDIANA AMERICAN WATER - JOHNSON COUNTY service area
This water system serves 1 community in Johnson County, Indiana. Click any city for its dedicated tap water quality page.
Find the right filter for GREENWOOD water
Browse filter categories by water-quality concern. Each option below is NSF-certified for the matched contaminant type.