C56/100
Rathdrum Tap Water Quality: Is It Safe to Drink? (2026 Report)
Serving 21,202 residents · Idaho
What's In Rathdrum's Tap Water?
31
Contaminants Tested
0
Exceed EPA Limits
0
Above EPA Goals
EPA Violation History
3
Violations (last 5yr)
3
Unresolved
0
Health-Related
TIER 3Unresolved
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.
TIER 3Unresolved
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.
TIER 3Unresolved
Monitoring / Reporting Violation
This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.
When: December 30, 2023Rule: 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
RIMROCK SERVICE AREA
Population Served
3,493
Water Source
Groundwater
System ID
ID1280009
HILLSIDE SERVICE AREA
Population Served
4,140
Water Source
Groundwater
System ID
ID1280095
TWIN LAKES SERVICE AREA
Population Served
2,023
Water Source
Groundwater
System ID
ID1280099
RATHDRUM CITY OF
Population Served
10,358
Water Source
Groundwater
System ID
ID1280152
HAYDEN PINES GROUSE MEADOWS
Population Served
1,188
Water Source
Groundwater
System ID
ID1280257
Frequently Asked Questions About Rathdrum Water
Is Rathdrum tap water safe to drink?
Rathdrum, Idaho tap water receives a grade of C (56/100), which is considered fair. 0 contaminant(s) exceed EPA maximum contaminant levels and 147 violation(s) are on record. Residents should consider using an NSF-certified water filter to reduce contaminant exposure.
What contaminants are in Rathdrum's water?
Of the 31 contaminants tested in Rathdrum's water supply, the most notable include Lead (90th percentile). No contaminants exceed EPA legal limits. 1 contaminant(s) exceed EPA health goals (MCLGs), which are non-enforceable targets set at levels with no known health risk.
Does Rathdrum have any water quality violations?
Yes, Rathdrum has 147 EPA violation(s) on record, with the most recent in 2025. Violation types include MR, MCL. 16 of these are health-based violations, which are the most serious category.
Do I need a water filter in Rathdrum?
Rathdrum 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. 1 contaminant(s) exceed these stricter goals.
Where does Rathdrum's tap water come from?
Rathdrum's drinking water is sourced from groundwater and supplied by RIMROCK SERVICE AREA and 4 other water system(s). The system serves approximately 21,202 people. Groundwater is pumped from underground aquifers, which often provides natural filtration.
How often is Rathdrum'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. Rathdrum'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 Rathdrum's water compare to other cities in Idaho?
Rathdrum's water quality score of 56/100 earns a grade of C, which is considered fair. This is a below-average score that indicates room for improvement. Visit our Idaho state page to see how all cities in the state compare.
What should I do if I'm concerned about Rathdrum's water quality?
If you have concerns about Rathdrum'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 (RIMROCK SERVICE AREA) 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.