C49/100
St. John Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 25,700 residents · Indiana
What's In St. John's Tap Water?
66
Contaminants Tested
0
Exceed EPA Limits
2
Above EPA Goals
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
strontium | 1800.00 µg/L | — | Above Goal |
Lead (90th percentile) | 0.003 mg/L | 0.015 mg/L | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2007.
Understanding violation severity
Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.
Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly
Water Utility Details
ST. JOHN MUNICIPAL WATER UTILITY
Population Served
25,700
Water Source
Groundwater
System ID
IN5245043
Frequently Asked Questions About St. John Water
Is St. John tap water safe to drink?
St. John, Indiana tap water receives a grade of C (49/100), which is considered fair. 0 contaminant(s) exceed EPA maximum contaminant levels and 33 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in St. John's water?
Of the 66 contaminants tested in St. John's water supply, the most notable include Lead (90th percentile), strontium. No contaminants exceed EPA legal limits. 2 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does St. John have any water quality violations?
Yes, St. John has 33 EPA violation(s) on record, with the most recent in 2007. Violation types include MCL, MR. 3 of these are health-based violations, which are the most serious category.
Do I need a water filter in St. John?
St. John water meets EPA standards, so a filter is not strictly necessary. However, some residents prefer the added security of a water filter. EPA health goals (MCLGs) are stricter than legal limits and are set at levels with zero expected health risk. 2 contaminant(s) exceed these stricter goals.
Where does St. John's tap water come from?
St. John's drinking water is sourced from groundwater and supplied by ST. JOHN MUNICIPAL WATER UTILITY. The system serves approximately 25,700 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is St. John's water tested?
Under the Safe Drinking Water Act (SDWA), water utilities are required to regularly test for over 90 contaminants. Testing frequency varies by contaminant — some are tested monthly, others quarterly or annually. St. John's water systems must report results to the EPA and publish an annual Consumer Confidence Report (CCR). The data on this page reflects the latest available EPA testing data.
How does St. John's water compare to other cities in Indiana?
St. John's water quality score of 49/100 earns a grade of C, which is considered fair. This is a below-average score that indicates room for improvement. Visit our Indiana state page to see how all cities in the state compare.
What should I do if I'm concerned about St. John's water quality?
If you have concerns about St. John's tap water, consider these steps: (1) Request your utility's annual Consumer Confidence Report for detailed local data. (2) Get your water independently tested through a state-certified laboratory. (3) Consider an NSF-certified water filter rated for the contaminants found in your area. (4) Contact your water utility (ST. JOHN MUNICIPAL WATER UTILITY) with specific questions. (5) Report water quality issues to your state drinking water program or the EPA Safe Drinking Water Hotline at 800-426-4791.