Lewisville, ID Water Safety: 63/100 (2026)
1 ZIP code · 1 water system · Updated 2026-06-03
Unlike higher-rated cities in ID, Lewisville carries a fair number of documented violations — the pattern of compliance gaps keeps the city in the middle tier of EPA safety rankings.
How Lewisville Compares
Data: EPA SDWIS Last verified: 2026-06-03
Lewisville Water: The Quick Version
- Homes built before 1986: 61% — older plumbing may contain lead solder.
- Estimated remediation: $1,600 per household.
- CDC health risk index: 11.31.
Water Systems Serving Lewisville
Federal drinking water records identify 1 system operating in Lewisville, ID. One of those systems serves the overwhelming majority of residential addresses, concentrating infrastructure management, rate authority, and EPA compliance reporting within a single organization.
Overview
We track water quality and home safety data for 1 ZIP code in Lewisville, Idaho, covering 1 community water system serving approximately 1,066 people.
No EPA violations recorded across any ZIP codes in Lewisville — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Lewisville: C (63/100)
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
Lewisville water systems draw from: Groundwater.
Lead & Copper
- Lead data: not yet available for Lewisville
- 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 |
|---|---|---|---|
| 83431 | C | ROBERTS CITY OF | 680 |
All ZIP Codes in Lewisville
- 83431 [C]
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 Lewisville
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
How Old Is Lewisville's Housing Stock?
With 61% 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
When a city's housing median build year is 1975, as in Lewisville, the implication for water quality research is straightforward: municipal-level data captures what leaves the treatment plant, but household plumbing from before 1986 determines what actually arrives at the tap. In cities where older housing predominates, that gap between system-level and household-level data is widest.
Over half of homes in Lewisville 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.
Lewisville: Remediation Cost in Perspective
The household financial picture for Lewisville homeowners is proportionally favorable — addressing documented issues claims a small slice of equity, and the cost-to-value ratio puts this area well within the manageable tier.
Remediation costs in Lewisville are relatively low compared to home values. The $800–$2,600 estimated range is a small fraction of median property value. Home values are 28% below the Idaho average.
Protecting Children from Lead in Lewisville
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.
After the federal action removing lead-bearing solder from new plumbing took effect, building practice shifted — but 61% of the Lewisville inventory predates that line. With aggregate samples near or beyond 0.015 mg/L, an in-home check moves out of the optional column into the standard list.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Climate-Related Water Risk for Lewisville
Flood risk in Lewisville occupies the middle ground: 2 NFIP claims and 100% of local ZIP codes within FEMA flood zones. At that level, the risk pathways connecting flooding to water quality — treatment system stress, well infiltration, distribution backflow — become relevant considerations during significant flood events, even if day-to-day water quality is unaffected by flood history.
Lewisville has a moderate flood history with 2 FEMA claims averaging $5,484 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>$1,600</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 Lewisville
- 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. With 61% of homes built before 1986, lead solder is a real possibility.
Deep Dive Reports
Detailed analysis for Lewisville, ID