Dennison, IL Water Safety: 53/100 (2026)
1 ZIP code · 1 water system · Updated 2026-06-03
Water systems serving Dennison record elevated violation rates against IL benchmarks — residents in affected areas may want to check their local system's current compliance status.
How Dennison Compares
Data: EPA SDWIS Last verified: 2026-06-03
Key Facts for Dennison Residents
- Homes built before 1986: 28% — older plumbing may contain lead solder.
- Estimated remediation: $400 per household.
- CDC health risk index: 13.79 — above typical levels.
Dennison's Water Providers
Federal records list 1 water system serving Dennison, IL. One provider accounts for the large majority of residential water connections in the area, concentrating infrastructure and compliance accountability.
Overview
We track water quality and home safety data for 1 ZIP code in Dennison, Illinois (population ~609), covering 1 community water system serving approximately 5,801 people region-wide.
No EPA violations recorded across any ZIP codes in Dennison — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Dennison: D (53/100)
The score combines three factors:
| Factor | What It Measures |
|---|---|
| Water Quality | EPA violations and compliance history |
| Lead Levels | 90th percentile lead concentration vs EPA action level |
| Radon Risk | EPA radon zone classification |
Water Sources
Dennison water systems draw from: Groundwater.
Lead & Copper
- Lead data: not yet available for Dennison
- 0 ZIP codes exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Areas with No Violations
| ZIP Code | Safety Score | System | Population |
|---|---|---|---|
| 62423 | D | CLARK-EDGAR RWD | 5,801 |
All ZIP Codes in Dennison
- 62423 [D]
Data Sources
- Water quality: EPA Safe Drinking Water Information System (SDWIS)
- Lead/copper: EPA Lead and Copper Rule sampling data
- Radon: EPA Map of Radon Zones
Updated daily.
Dennison Community Health Snapshot
Source: CDC PLACES (County-level estimates). Water contamination can correlate with respiratory and chronic health conditions.
Compared to National Average
Vertical line = national average. ■ Above national · ■ Below national
Dennison Infrastructure Age
Housing age data helps assess potential lead pipe and infrastructure risks. Newer housing stock generally means lower plumbing-related contamination risk.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Copper plumbing joined with lead solder was standard practice through the mid-1980s — a design choice that federal regulators prohibited in 1986. Dennison's residential inventory, centered around a median build year of 2008, is weighted toward the post-prohibition era. That context is relevant because the primary plumbing risk in older homes comes not from the municipal water supply but from what happens as water moves through lead-jointed pipes inside the structure — an exposure pathway that newer homes mostly avoid.
Most homes in Dennison were built after 1986, reducing the risk of lead contamination from plumbing. Older homes should still be tested.
Source: U.S. Census Bureau ACS B25034.
How Remediation Costs Compare in Dennison
Across Dennison, the equity share taken up by estimated remediation is small — a favorable ratio for most property owners.
Remediation costs in Dennison are relatively low compared to home values. The $0–$800 estimated range is a small fraction of median property value. Home values are 20% below the Illinois average.
Dennison: Lead Risk & Vulnerable Populations
Why children are most at risk: The CDC states there is no safe level of lead exposure for children. Children under 6 absorb lead more readily than adults, and even low levels can cause developmental delays, learning difficulties, and behavioral problems.
28% of housing in Dennison predates the federal action against lead solder — a contained share — and aggregate readings stay beneath the regulatory benchmark. Lead therefore sits in a quiet position on the local water-quality picture, with single-home draws as the standard tool for confirming any one address.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
What You Can Do in Dennison
- Test your water at home. City-level data shows averages — your tap may differ. NSF-certified test kits cost $20-40 and give results in days.
- Install a certified water filter. An NSF-certified pitcher or under-sink filter removes most common contaminants.
- Check your home's plumbing. Homes built before 1986 may have lead solder in pipes. A licensed plumber can assess your risk.
- Review your water system's CCR. Your utility publishes an annual Consumer Confidence Report with detailed test results. Request it or find it online.
Deep Dive Reports
Detailed analysis for Dennison, IL