Marion County, Indiana
60 ZIP codes · Avg score 49/100 · Grade D · Updated 2026-06-03
Within Marion County's 60 monitored ZIP codes, water quality data indicates below-average safety — independent testing is a reasonable precaution.
How Marion County Compares
How Marion County Compares
Marion County scores 11 points below the Indiana state average (60/100) and 19 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Marion County, Indiana
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.4 (asthma 11.8%, diabetes 13%)
Estimated additional annual cost per homeowner: $982, driven primarily by flood
Infrastructure: 0.424% avg pipe failure probability, 38% of ZIPs at high risk
Violation History (2021–2025)
→ Stable trendEPA violation counts by year across Marion County water systems. Health-based shown in red, total in blue.
Peak year: 2025 with 180 violations. Past 5 years: 246 total (246 health-based).
Source: EPA SDWIS historical violations. Data may lag 6–12 months for the most recent year.
County Health Indicators vs National Average
Black markers indicate national averages. Source: CDC PLACES, Census ACS.
Infrastructure Overview
Sources: Census ACS (housing age), EPA SDWIS (infrastructure risk model), state bridge inspection data.
Compound Risk Breakdown
Estimated additional annual cost per homeowner: $982
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Water Safety Affordability
How much it costs to fix water issues relative to home values in Marion County
Remediation costs are relatively manageable for most homeowners in Marion County, representing a small fraction of property value.
Remediation includes water filtration, lead abatement, radon mitigation, and flood protection where applicable. Source: Census ACS, EPA SDWIS.
Health Outcomes vs National Average
CDC PLACES data for Marion County residents
Black markers = national averages. Red = above national avg. Green = below. Source: CDC PLACES, Census ACS.
Water Systems with Most Violations
Top 5 systems in Marion County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Citizens Water - Indianapolis | 880,345 | 1560 |
| 2 | Citizens Water of Westfield, Llc | 61,493 | 1560 |
| 3 | City of Lawrence Utilities | 49,000 | 1560 |
| 4 | Citizens Water - Morgan | 5,705 | 1560 |
| 5 | New Castle Correctional Facility | 3,160 | 1560 |
11 total water systems serve Marion County.
All ZIP Codes in Marion County
60 ZIP codes tracked in Marion County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 46202 | Indianapolis | 56 | C | 26 (5 health) | $420K |
| 2 | 46204 | Indianapolis | 56 | C | 26 (5 health) | $350K |
| 3 | 46206 | Indianapolis | 56 | C | 26 (5 health) | — |
| 4 | 46231 | Indianapolis | 56 | C | 26 (5 health) | $204K |
| 5 | 46235 | Indianapolis | 56 | C | 26 (5 health) | $169K |
| 6 | 46236 | Indianapolis | 56 | C | 26 (5 health) | $282K |
| 7 | 46239 | Indianapolis | 56 | C | 26 (5 health) | $253K |
| 8 | 46254 | Indianapolis | 56 | C | 26 (5 health) | $176K |
| 9 | 46278 | Indianapolis | 56 | C | 26 (5 health) | $420K |
| 10 | 46201 | Indianapolis | 51 | D | 26 (5 health) | $151K |
| 11 | 46208 | Indianapolis | 51 | D | 26 (5 health) | $206K |
| 12 | 46214 | Indianapolis | 51 | D | 26 (5 health) | $180K |
| 13 | 46218 | Indianapolis | 51 | D | 26 (5 health) | $90K |
| 14 | 46222 | Indianapolis | 51 | D | 26 (5 health) | $104K |
| 15 | 46225 | Indianapolis | 51 | D | 26 (5 health) | $124K |
| 16 | 46229 | Indianapolis | 51 | D | 26 (5 health) | $170K |
| 17 | 46237 | Indianapolis | 51 | D | 26 (5 health) | $216K |
| 18 | 46250 | Indianapolis | 51 | D | 26 (5 health) | $289K |
| 19 | 46256 | Indianapolis | 51 | D | 26 (5 health) | $278K |
| 20 | 46259 | Indianapolis | 51 | D | 26 (5 health) | $305K |
| 21 | 46260 | Indianapolis | 51 | D | 26 (5 health) | $272K |
| 22 | 46268 | Indianapolis | 51 | D | 26 (5 health) | $209K |
| 23 | 46207 | Indianapolis | 48 | D | 26 (5 health) | — |
| 24 | 46209 | Indianapolis | 48 | D | 26 (5 health) | — |
| 25 | 46211 | Indianapolis | 48 | D | 26 (5 health) | — |
| 26 | 46213 | Indianapolis | 48 | D | 26 (5 health) | — |
| 27 | 46216 | Indianapolis | 48 | D | 26 (5 health) | $254K |
| 28 | 46223 | Indianapolis | 48 | D | 26 (5 health) | — |
| 29 | 46230 | Indianapolis | 48 | D | 26 (5 health) | — |
| 30 | 46242 | Indianapolis | 48 | D | 26 (5 health) | — |
| 31 | 46244 | Indianapolis | 48 | D | 26 (5 health) | — |
| 32 | 46247 | Indianapolis | 48 | D | 26 (5 health) | — |
| 33 | 46249 | Indianapolis | 48 | D | 26 (5 health) | — |
| 34 | 46251 | Indianapolis | 48 | D | 26 (5 health) | — |
| 35 | 46253 | Indianapolis | 48 | D | 26 (5 health) | — |
| 36 | 46255 | Indianapolis | 48 | D | 26 (5 health) | — |
| 37 | 46262 | Indianapolis | 48 | D | 26 (5 health) | — |
| 38 | 46266 | Indianapolis | 48 | D | 26 (5 health) | — |
| 39 | 46274 | Indianapolis | 48 | D | 26 (5 health) | — |
| 40 | 46275 | Indianapolis | 48 | D | 26 (5 health) | — |
| 41 | 46277 | Indianapolis | 48 | D | 26 (5 health) | — |
| 42 | 46282 | Indianapolis | 48 | D | 26 (5 health) | — |
| 43 | 46283 | Indianapolis | 48 | D | 26 (5 health) | — |
| 44 | 46285 | Indianapolis | 48 | D | 26 (5 health) | — |
| 45 | 46291 | Indianapolis | 48 | D | 26 (5 health) | — |
| 46 | 46295 | Indianapolis | 48 | D | 26 (5 health) | — |
| 47 | 46296 | Indianapolis | 48 | D | 26 (5 health) | — |
| 48 | 46298 | Indianapolis | 48 | D | 26 (5 health) | — |
| 49 | 46203 | Indianapolis | 46 | D | 26 (5 health) | $156K |
| 50 | 46205 | Indianapolis | 46 | D | 26 (5 health) | $278K |
| 51 | 46217 | Indianapolis | 46 | D | 26 (5 health) | $226K |
| 52 | 46219 | Indianapolis | 46 | D | 26 (5 health) | $177K |
| 53 | 46221 | Indianapolis | 46 | D | 26 (5 health) | $175K |
| 54 | 46224 | Indianapolis | 46 | D | 26 (5 health) | $167K |
| 55 | 46226 | Indianapolis | 46 | D | 26 (5 health) | $149K |
| 56 | 46227 | Indianapolis | 46 | D | 26 (5 health) | $193K |
| 57 | 46228 | Indianapolis | 46 | D | 26 (5 health) | $241K |
| 58 | 46241 | Indianapolis | 46 | D | 26 (5 health) | $112K |
| 59 | 46220 | Indianapolis | 41 | D | 26 (5 health) | $330K |
| 60 | 46240 | Indianapolis | 41 | D | 26 (5 health) | $329K |
Recommended Buyer Guides for Marion County
Where county records show a lead exceedance or pre-1978 housing concentration, lead-specific filters and test kits move toward the top of the list.
- Best Under-Sink Reverse Osmosis Systems — Multi-contaminant removal at the kitchen tap
- Best Radon Test Kits — EPA Radon Zone 1 (highest risk) dominant in county
- Best Sump Pumps — Flood is the top compound risk factor
- Best Mold Test Kits — Flood-driven moisture and mold risk
Deep Dive Reports
Detailed analysis for Marion County, Indiana
Overview
Marion County in Indiana covers 60 ZIP codes with an average Home Safety Score of D (49/100).
60 of 60 ZIP codes have recorded EPA violations. 300 health-based violations have been documented.
← Back to Indiana water quality report
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Home values: U.S. Census Bureau ACS (median estimates by ZCTA)
Updated daily.
What You Can Do
Marion County has a grade of D. Here are steps to protect your household.
Test your tap water
Order a certified lab test kit ($20-$50) to check for lead, bacteria, and other contaminants specific to your ZIP code.
Consider a certified water filter
NSF-certified filters can remove most common contaminants. Match the filter to your test results for best protection. Try our filter matcher
Contact your water utility
Request the latest Consumer Confidence Report (CCR) from your water provider. It details exactly what was found in your water supply.