DeKalb County, Indiana
6 ZIP codes · Avg score 76/100 · Grade B · Updated 2026-06-03
The 6 water systems serving DeKalb County show strong compliance with federal drinking water standards.
How DeKalb County Compares
How DeKalb County Compares
DeKalb County scores 16 points above the Indiana state average (60/100) and 8 points above the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: DeKalb County, Indiana
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 14.7 (asthma 11.2%, diabetes 12.8%)
Estimated additional annual cost per homeowner: $1,387, driven primarily by flood
Infrastructure: 0.435% avg pipe failure probability, 67% of ZIPs at high risk
64.7% of homes built before 1978 (lead paint era)
Violation History (2022–2025)
↑ Worsening trendEPA violation counts by year across DeKalb County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 3 violations. Past 5 years: 6 total (6 health-based). Health-based violations are rising versus the prior 2-year window — worth closer monitoring.
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: $1,387
Bar widths proportional to share of total annual risk cost. Source: compound risk model (FEMA, EPA, USGS).
Housing Age Distribution
16,853 housing units in DeKalb County
Source: U.S. Census Bureau ACS B25034 (Year Structure Built).
Water Safety Affordability
How much it costs to fix water issues relative to home values in DeKalb County
Remediation costs are relatively manageable for most homeowners in DeKalb 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 DeKalb 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 DeKalb County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | Waterloo Water Works | 2,242 | 14 |
| 2 | Ashley Water Department | 983 | 12 |
| 3 | Butler Water Department | 2,700 | 11 |
| 4 | Auburn Water Department | 12,800 | 10 |
| 5 | St. Joe Water Department | 460 | 9 |
13 total water systems serve DeKalb County.
All ZIP Codes in DeKalb County
6 ZIP codes tracked in DeKalb County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 46730 | Corunna | 88 | A | 1 | $279K |
| 2 | 46738 | Garrett | 86 | A | 4 (1 health) | $156K |
| 3 | 46793 | Waterloo | 75 | B | 9 (2 health) | $178K |
| 4 | 46706 | Auburn | 74 | B | 4 | $195K |
| 5 | 46721 | Butler | 74 | B | 2 | $124K |
| 6 | 46785 | Saint Joe | 60 | C | 0 | $182K |
Recommended Buyer Guides for DeKalb County
Four sources — EPA, NSF, FEMA, CDC — drive the match.
- Best Lead Paint Test Kits — 64.7% of homes built before 1978
- 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 DeKalb County, Indiana
Overview
DeKalb County in Indiana covers 6 ZIP codes with an average Home Safety Score of B (76/100).
5 of 6 ZIP codes have recorded EPA violations. 3 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.