Sangamon County, Illinois
56 ZIP codes · Avg score 53/100 · Grade D · Updated 2026-06-03
Water safety in Sangamon County ranks low — 56 ZIP codes, persistent health-based violations on record.
How Sangamon County Compares
How Sangamon County Compares
Sangamon County scores 8 points below the Illinois state average (61/100) and 15 points below the national average (68/100).
Data: EPA SDWIS Last verified: 2026-06-03
ZIP Code Risk Map
Water Quality Map: Sangamon County, Illinois
Each dot represents a ZIP code. Color indicates water quality grade. Tap a dot for details.
Key Risk Factors
Health risk index: 13.5 (asthma 10.5%, diabetes 11.9%)
Estimated additional annual cost per homeowner: $620, driven primarily by flood
Infrastructure: 0.331% avg pipe failure probability, 22% of ZIPs at high risk
Violation History (2021–2024)
↑ Worsening trendEPA violation counts by year across Sangamon County water systems. Health-based shown in red, total in blue.
Peak year: 2024 with 6 violations. Past 5 years: 13 total (13 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: $620
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 Sangamon County
Remediation costs are relatively manageable for most homeowners in Sangamon 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 Sangamon 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 Sangamon County ranked by EPA violation count.
| # | Water System | Population | Violations |
|---|---|---|---|
| 1 | SPRINGFIELD | 117,444 | 367 |
| 2 | Curran-gardner Township Pwd | 6,651 | 366 |
| 3 | Jerome | 1,600 | 342 |
| 4 | Grandview | 1,405 | 342 |
| 5 | Grand Valley Village Mhp | 912 | 342 |
24 total water systems serve Sangamon County.
All ZIP Codes in Sangamon County
56 ZIP codes tracked in Sangamon County.
| # | ZIP Code | City | Safety Score | Grade | Violations | Home Value |
|---|---|---|---|---|---|---|
| 1 | 62689 | Thayer | 70 | B | 1 | $86K |
| 2 | 62563 | Rochester | 68 | C | 1 | $256K |
| 3 | 62661 | Loami | 66 | C | 0 | $161K |
| 4 | 62558 | Pawnee | 65 | C | 0 | $176K |
| 5 | 62629 | Chatham | 65 | C | 0 | $232K |
| 6 | 62561 | Riverton | 64 | C | 3 | $156K |
| 7 | 62670 | New Berlin | 62 | C | 21 (5 health) | $188K |
| 8 | 62693 | Williamsville | 62 | C | 1 | $194K |
| 9 | 62701 | Springfield | 58 | C | 9 | — |
| 10 | 62711 | Springfield | 58 | C | 9 | $299K |
| 11 | 62712 | Springfield | 58 | C | 9 | $244K |
| 12 | 62761 | Springfield | 58 | C | 9 | — |
| 13 | 62530 | Divernon | 57 | C | 0 | $145K |
| 14 | 62539 | Illiopolis | 57 | C | 11 (4 health) | $108K |
| 15 | 62615 | Auburn | 57 | C | 4 | $154K |
| 16 | 62684 | Sherman | 53 | D | 0 | $292K |
| 17 | 62702 | Springfield | 53 | D | 9 | $102K |
| 18 | 62703 | Springfield | 53 | D | 9 | $93K |
| 19 | 62704 | Springfield | 53 | D | 9 | $167K |
| 20 | 62707 | Springfield | 53 | D | 9 | $164K |
| 21 | 62515 | Buffalo | 51 | D | 13 | $154K |
| 22 | 62705 | Springfield | 51 | D | 9 | — |
| 23 | 62706 | Springfield | 51 | D | 9 | — |
| 24 | 62708 | Springfield | 51 | D | 9 | — |
| 25 | 62713 | Springfield | 51 | D | 9 | — |
| 26 | 62715 | Springfield | 51 | D | 9 | — |
| 27 | 62716 | Springfield | 51 | D | 9 | — |
| 28 | 62719 | Springfield | 51 | D | 9 | — |
| 29 | 62721 | Springfield | 51 | D | 9 | — |
| 30 | 62722 | Springfield | 51 | D | 9 | — |
| 31 | 62723 | Springfield | 51 | D | 9 | — |
| 32 | 62726 | Springfield | 51 | D | 9 | — |
| 33 | 62736 | Springfield | 51 | D | 9 | — |
| 34 | 62739 | Springfield | 51 | D | 9 | — |
| 35 | 62746 | Springfield | 51 | D | 9 | — |
| 36 | 62756 | Springfield | 51 | D | 9 | — |
| 37 | 62757 | Springfield | 51 | D | 9 | — |
| 38 | 62762 | Springfield | 51 | D | 9 | — |
| 39 | 62763 | Springfield | 51 | D | 9 | — |
| 40 | 62764 | Springfield | 51 | D | 9 | — |
| 41 | 62765 | Springfield | 51 | D | 9 | — |
| 42 | 62766 | Springfield | 51 | D | 9 | — |
| 43 | 62767 | Springfield | 51 | D | 9 | — |
| 44 | 62769 | Springfield | 51 | D | 9 | — |
| 45 | 62776 | Springfield | 51 | D | 9 | — |
| 46 | 62777 | Springfield | 51 | D | 9 | — |
| 47 | 62781 | Springfield | 51 | D | 9 | — |
| 48 | 62786 | Springfield | 51 | D | 9 | — |
| 49 | 62791 | Springfield | 51 | D | 9 | — |
| 50 | 62794 | Springfield | 51 | D | 9 | — |
| 51 | 62796 | Springfield | 51 | D | 9 | — |
| 52 | 62677 | Pleasant Plains | 44 | D | 3 | $211K |
| 53 | 62536 | Glenarm | 40 | D | 0 | $246K |
| 54 | 62545 | Mechanicsburg | 40 | D | 0 | $160K |
| 55 | 62662 | Lowder | 40 | D | 0 | — |
| 56 | 62520 | Dawson | 29 | F | 5 | $225K |
Recommended Buyer Guides for Sangamon County
Four sources — EPA, NSF, FEMA, CDC — drive the match.
- Best Water Filters for Lead — Lead above EPA action level in 2 ZIP codes
- 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 Sangamon County, Illinois
Overview
Sangamon County in Illinois covers 56 ZIP codes with an average Home Safety Score of D (53/100).
48 of 56 ZIP codes have recorded EPA violations. 9 health-based violations have been documented.
← Back to Illinois 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
Sangamon 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.