Water Quality in Saint John, IN: No Violations - Grade C
Grade C · Score 63/100 · 3 water systems · Updated 2026-07-18
Saint John's water has moderate compliance issues. Residents in affected areas should consider filtration.
Data: EPA Safe Drinking Water Information System (SDWIS) Last verified: 2026-07-18
Unlike many metros where compliance gaps appear somewhere in the record, Saint John, IN holds a violation-free federal history - EPA data covers 3 local water systems and every one has cleared every applicable threshold without a single flagged event.
Water Quality by ZIP Code in Saint John
Saint John is covered by a single ZIP code, so one water-quality profile applies citywide. See the contaminant data below.
| ZIP Code | Grade | Score | Violations | Health | |
|---|---|---|---|---|---|
| 46373 | C | 63 | 0 | 0 | View report → |
Water Quality Overview
Saint John, Indiana receives a water quality grade of C with an overall score of 63 out of 100, based on EPA compliance data from the Safe Drinking Water Information System (SDWIS).
No EPA violations have been recorded for the 3 water systems serving Saint John. This is a positive indicator, though it does not guarantee the absence of all contaminants - some substances (like PFAS) are not yet fully regulated.
What Grade C Means
A grade of C indicates moderate compliance issues. Saint John's water systems have some violations that warrant attention. While the water may still be safe for most people, residents in affected ZIP codes should consider additional testing or filtration.
Lead Levels
Lead testing data for Saint John is currently being collected. The EPA requires all community water systems to test for lead under the Lead and Copper Rule.
Radon Risk
Saint John is in EPA Radon Zone 2 (Moderate risk). Testing is recommended, especially for homes with basements or ground-level living spaces.
Water Systems Serving Saint John
Saint John is served by 3 community water systems regulated under the Safe Drinking Water Act. These systems collectively serve approximately 18,509 people across 1 ZIP code.
Each water system is identified by a Public Water System ID (PWSID) and is required to:
- Test for over 90 regulated contaminants on a regular schedule
- Report results to the EPA and state regulators
- Issue an annual Consumer Confidence Report (CCR) to all customers
- Take corrective action when violations occur
The EPA has taken 10 enforcement actions against water systems serving Saint John. Enforcement actions range from informal compliance assistance to formal orders and penalties.
How to Check Your Water in Saint John
Enter your ZIP code on ZipCheckup to see your specific water system data, including contaminant levels, violation history, and safety scores
Request your CCR - your water utility must provide an annual Consumer Confidence Report with detailed test results for all monitored contaminants
Get a home test - certified kits cost $20–$50 and test for lead, bacteria, and common contaminants. Professional lab tests ($150–$400) cover a broader panel
Consider filtration - NSF-certified filters can remove specific contaminants. Reverse osmosis removes the broadest range; activated carbon is effective for chlorine and many organics
Check for advisories - monitor your local utility website and local news for boil water advisories or system alerts
EPA Enforcement History
The EPA and state regulators have taken 10 enforcement actions against water systems serving Saint John. Recent actions:
| Date | Action Type |
|---|---|
| 2025-10-21 | State Order Extension |
| 2025-07-17 | State Informal Action |
| 2025-04-28 | State Informal Action |
| 2025-04-28 | State Informal Enforcement |
| 2025-04-03 | State Order Extension |
| 2021-12-01 | State Order Extension |
| 2021-11-24 | State Informal Action |
| 2021-11-24 | State Informal Enforcement |
| 2021-10-07 | State Order Extension |
| 2021-09-29 | State Informal Action |
Enforcement actions range from informal compliance assistance to formal orders and penalties. The most recent action was on 2025-10-21.
Saint John vs. Nearby Indiana Cities
How Saint John's water quality compares to similar cities in Indiana:
| City | Grade | Violations | Systems | Population |
|---|---|---|---|---|
| Saint John | C | 0 | 3 | 18,509 |
| Lake Cicott | D | 0 | 1 | 18,369 |
| Washington | C | 6 | 3 | 18,335 |
| Brazil | B | 1 | 5 | 18,773 |
Common Questions About Saint John Water
These are the most common questions residents search for about water quality in Saint John, Indiana:
Is Saint John water hard or soft? Water hardness varies by source. Saint John's 3 water systems use multiple sources. Check your ZIP code report for specific hardness data.
Can I drink Saint John tap water? Saint John's water receives a grade of C (63/100). No health-based violations have been recorded, but home testing is always recommended.
What is the best water filter for Saint John? A NSF/ANSI 53-certified filter for lead removal is a good general choice. See our Water Filter Matcher for personalized recommendations.
Saint John vs. Indiana Average
Understanding how Saint John compares to the broader Indiana average helps contextualize your local water quality. Factors like water source, treatment methods, and infrastructure age all contribute to differences between cities in the same state.
To see how individual neighborhoods compare, check the ZIP code reports below - water quality can vary significantly even within Saint John.
ZIP Codes in Saint John
Saint John spans 1 ZIP code. Each ZIP code has its own water quality profile based on the specific water system serving that area. Check each ZIP code for detailed contaminant data, violation history, and system information.
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
- Enforcement: EPA ECHO database
- Filter recommendations: NSF/ANSI certified products
Updated daily.