Delavan, IL: Lead Above EPA Limits — 44/100 (2026)
1 ZIP code · 2 water systems · Updated 2026-06-03
Public water compliance in Delavan falls below the IL baseline — elevated violation rates are on record.
How Delavan Compares
Data: EPA SDWIS Last verified: 2026-06-03
Delavan Water: The Quick Version
- Your city's water systems recorded 3 violations in the past 5 years.
- Average lead level: 0.033 mg/L — exceeds the EPA action level of 0.015 mg/L.
- Homes built before 1986: 90% — older plumbing may contain lead solder.
- Estimated remediation: $7,800 per household.
- CDC health risk index: 13.08 — above typical levels.
Water Systems Serving Delavan
Federal drinking water records identify 2 systems in Delavan, IL. The leading 2 providers serve the largest share of residential connections, each operating as a separate entity with its own rate authority, infrastructure management, and EPA compliance obligations — so service conditions are not uniform city-wide.
Overview
We track water quality and home safety data for 1 ZIP code in Delavan, Illinois, covering 2 community water systems serving approximately 2,500 people.
1 of 1 ZIP code (100%) have recorded EPA violations. All violations are monitoring/reporting type.
Home Safety Score
Average Home Safety Score for Delavan: D (44/100)
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
Delavan water systems draw from: Groundwater.
Lead & Copper
- Average lead level (90th percentile): 0.0330 mg/L (exceeds EPA action level) (EPA action level: 0.015 mg/L)
- 1 ZIP code exceed the EPA lead action level
Radon Risk
Dominant radon zone: Zone 1 (High Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Top Contaminants
| Contaminant | Category | Violations | ZIPs Affected |
|---|---|---|---|
| Stage 1 DBP Rule | Treatment Technique | 4 | 1 |
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 2 | 1 |
Areas with Most Violations
| ZIP Code | Safety Score | Violations | Health-Based | System |
|---|---|---|---|---|
| 61734 | D | 3 | 0 | Delavan |
All ZIP Codes in Delavan
- 61734 [D] — 3 violations
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.
CDC Health Data for Delavan
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
Key Contaminants Detected in Delavan
Based on EPA violation records. Check your ZIP code report for system-specific contaminant data.
How Old Is Delavan's Housing Stock?
With 90% of homes built before 1986, lead solder in plumbing is a potential concern. The EPA banned lead solder in 1986, but many older homes retain original plumbing.
Source: U.S. Census Bureau American Community Survey (ACS).
Housing Age Profile
Delavan's housing stock is predominantly older, with a median build year of 1953 that reflects decades of construction before federal plumbing standards were tightened. The 1986 ban on lead solder and the pre-1970 era of lead service lines are both relevant benchmarks here — a significant share of the residential inventory predates one or both of those cutoffs, creating an elevated baseline for plumbing-related lead risk that aggregate water quality data may not fully reflect at the household level.
Over half of homes in Delavan were built before 1986, when lead solder was banned. Older plumbing may leach lead into drinking water, especially with corrosive water chemistry.
Source: U.S. Census Bureau ACS B25034.
Delavan: Remediation Cost in Perspective
Looking at how documented remediation costs fit within Delavan's property market, the equity share lands in the elevated tier — a result that positions the household financial perspective as one requiring structured preparation, where mapping costs against household budget, documenting scope early, and sequencing by urgency are the practical tools that distinguish manageable outcomes from financially disruptive ones.
At 5.6% of home value, remediation costs in Delavan represent a significant financial burden. For homes valued near the median, fixing water and safety issues could cost $5,200–$10,500. Home values here are 24% below the Illinois average.
Protecting Children from Lead in Delavan
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.
Throughout the multi-year monitoring window under Lead and Copper Rule sampling, citywide samples for Delavan have moved past the regulatory action mark, and 90% of local stock comes from the pre-rule era. Both the housing inventory and the system data support active household-level reads as a practical step.
<strong>1 ZIP code</strong> (100% of the city) exceeds the EPA lead action level of 0.015 mg/L.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Climate-Related Water Risk for Delavan
Flood activity in Delavan is neither negligible nor at the level of the highest-exposure areas in the NFIP dataset. The 4-claim record and 100% flood zone coverage suggest a community that has experienced recurrent events but has not faced the kind of sustained, severe exposure where water-supply contamination becomes a primary public health concern. It sits in a middle range where flood history merits inclusion in any complete local water quality picture.
Delavan has a moderate flood history with 4 FEMA claims averaging $9,756 per payout. 100% of ZIP codes fall within FEMA flood zones. Flood events can contaminate drinking water and overwhelm treatment systems.
How flooding affects water quality: Flood events can introduce sewage, agricultural runoff, and industrial chemicals into water supplies. Even after floodwaters recede, contamination can persist in wells and aging infrastructure. Flood damage can add significantly to the estimated <strong>$7,800</strong> remediation cost per household.
Residents in flood-prone areas should consider flood insurance even outside FEMA zones — over 25% of flood claims come from low-to-moderate risk areas. After any flood event, test your water before drinking.
Source: FEMA National Flood Insurance Program (NFIP) claims data, FEMA flood zone designations.
What You Can Do in Delavan
- Test your water at home. City-level data shows averages — your tap may differ. Lead testing is especially recommended given the area's lead levels.
- Install a certified water filter. Filters rated for Stage 1 DBP Rule can reduce the most common contaminant found in Delavan's water.
- Check your home's plumbing. With 90% of homes built before 1986, lead solder is a real possibility.
- 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 Delavan, IL