A86/100
Columbus Junction Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 1,830 residents · Iowa
What's In Columbus Junction's Tap Water?
2
Contaminants Tested
1
Exceed EPA Limits
0
Above EPA Goals
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.40 mg/L | 1.30 mg/L | Over Limit |
EPA Violation History
2
Violations (last 5yr)
0
Unresolved
0
Health-Related
TIER 3Resolved
Failed Level 2 Assessment under Revised Total Coliform Rule
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: October 1, 2021 – October 31, 2021Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved
Failed Level 2 Assessment under Revised Total Coliform Rule
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: October 1, 2021 – October 31, 2021Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
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
COLUMBUS JUNCTION WATER SUPPLY
Population Served
1,830
Water Source
Groundwater
System ID
IA5815064
Frequently Asked Questions About Columbus Junction Water
Is Columbus Junction tap water safe to drink?
Columbus Junction, Iowa tap water receives a grade of A (86/100), which is considered excellent. Out of 2 contaminants tested, 1 exceed EPA maximum contaminant levels (MCLs) and 1 exceed health guidelines (MCLGs). While the water meets federal standards, some residents may still choose to use a filter for additional peace of mind.
What contaminants are in Columbus Junction's water?
Of the 2 contaminants tested in Columbus Junction's water supply, the most notable include Copper (90th percentile). 1 contaminant(s) exceed EPA legal limits (MCLs). 1 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Columbus Junction have any water quality violations?
Yes, Columbus Junction has 6 EPA violation(s) on record, with the most recent in 2021. Violation types include MR. None of these are classified as health-based violations.
Do I need a water filter in Columbus Junction?
Based on EPA data, using a water filter in Columbus Junction is recommended. 1 contaminant(s) exceed legal limits. An NSF-certified filter — such as a reverse osmosis or activated carbon system — can effectively reduce many common contaminants. Choose a filter certified to remove the specific contaminants found in your area.
Where does Columbus Junction's tap water come from?
Columbus Junction's drinking water is sourced from groundwater and supplied by COLUMBUS JUNCTION WATER SUPPLY. The system serves approximately 1,830 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Columbus Junction'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. Columbus Junction'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 Columbus Junction's water compare to other cities in Iowa?
Columbus Junction's water quality score of 86/100 earns a grade of A, which is considered excellent. This places Columbus Junction among the better-performing water systems in Iowa. Visit our Iowa state page to see how all cities in the state compare.
What should I do if I'm concerned about Columbus Junction's water quality?
If you have concerns about Columbus Junction'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 (COLUMBUS JUNCTION WATER SUPPLY) 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.