Saint John, IN Water Safety: 63/100 (2026)
1 ZIP code · 3 water systems · Updated 2026-06-03
Based on current EPA data, Saint John, IN reflects fair but uneven tap water safety.
How Saint John Compares
Data: EPA SDWIS Last verified: 2026-06-03
Saint John Water: The Quick Version
- Homes built before 1986: 29% — older plumbing may contain lead solder.
- Estimated remediation: $1,600 per household.
- CDC health risk index: 14.49 — above typical levels.
Water Systems Serving Saint John
3 independent water providers serve Saint John, IN — 3 systems appear in federal records.
Overview
We track water quality and home safety data for 1 ZIP code in Saint John, Indiana (population ~18,509), covering 3 community water systems serving approximately 76,800 people region-wide.
No EPA violations recorded across any ZIP codes in Saint John — an excellent indicator of water quality.
Home Safety Score
Average Home Safety Score for Saint John: 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
Saint John water systems draw from: Surface water.
Lead & Copper
- Lead data: not yet available for Saint John
- 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 |
|---|---|---|---|
| 46373 | C | SCHERERVILLE WATER DEPARTMENT | 30,000 |
All ZIP Codes in Saint John
- 46373 [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 Saint John
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 Saint John's Housing Stock?
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
Although a small portion of Saint John's homes predate 1986, the median build year of 1991 indicates the majority of the city's residential plumbing was installed after lead solder was banned — which tends to reduce the plumbing-related component of lead exposure at the household level.
Most homes in Saint John 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.
Saint John: Remediation Cost in Perspective
Across Saint John, the equity share taken up by estimated remediation is small — a favorable ratio for most property owners.
Remediation costs in Saint John are relatively low compared to home values. The $800–$2,600 estimated range is a small fraction of median property value. Home values are 110% above the Indiana average.
Protecting Children from Lead in Saint John
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.
In Saint John, the older-stock footprint runs at 29% — a contained slice — and aggregate utility readings land safely under the EPA action mark. That keeps lead off the local priority list, with a one-faucet draw remaining the only direct read on a specific address.
Sources: EPA Lead and Copper Rule, U.S. Census Bureau ACS, CDC childhood lead poisoning prevention guidelines.
Climate-Related Water Risk for Saint John
Flood risk in Saint John occupies the middle ground: 6 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.
Saint John has a moderate flood history with 6 FEMA claims averaging $6,973 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 Saint John
- 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.
Deep Dive Reports
Detailed analysis for Saint John, IN