C58/100
Terre Haute Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 2,913 residents · Indiana
What's In Terre Haute's Tap Water?
1
Contaminants Tested
0
Exceed EPA Limits
0
Above EPA Goals
EPA Violation History
2
Violations (last 5yr)
2
Unresolved
1
Health-Related
TIER 3Unresolved
Reporting violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: October 17, 2024Rule: Ground Water RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov
TIER 2Unresolved
Treatment technique violation
When: October 17, 2024Rule: Ground Water RuleEnforcement: Informal — resolved cooperativelyVerify on EPA.gov
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
KNIGHTSVILLE WATER WORKS
Population Served
1,523
Water Source
Purchased Groundwater
System ID
IN5211006
FCI & FPC - TERRE HAUTE
Population Served
1,390
Water Source
Groundwater
System ID
IN5284018
Frequently Asked Questions About Terre Haute Water
Is Terre Haute tap water safe to drink?
Terre Haute, Indiana tap water receives a grade of C (58/100), which is considered fair. 0 contaminant(s) exceed EPA maximum contaminant levels and 71 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Terre Haute's water?
1 contaminants were tested in Terre Haute's water supply. No contaminants exceed EPA legal limits (MCLs) or health goals (MCLGs), which is a positive indicator of water quality.
Does Terre Haute have any water quality violations?
Yes, Terre Haute has 71 EPA violation(s) on record, with the most recent in 2025. Violation types include Other, RPT, TT. 3 of these are health-based violations, which are the most serious category.
Do I need a water filter in Terre Haute?
Terre Haute 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. All contaminants are within health goals.
Where does Terre Haute's tap water come from?
Terre Haute's drinking water is sourced from purchased groundwater and supplied by KNIGHTSVILLE WATER WORKS and 1 other water system(s). The system serves approximately 2,913 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Terre Haute'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. Terre Haute'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 Terre Haute's water compare to other cities in Indiana?
Terre Haute's water quality score of 58/100 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 Terre Haute's water quality?
If you have concerns about Terre Haute'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 (KNIGHTSVILLE WATER WORKS) 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.