A84/100
LYON-SIOUX RWS-ROCK RAPIDS — Water Quality Report 2026
Serving 1,187 people · Iowa
Water Source
Purchased Groundwater
County
—
System ID
IA6000800
Violations
1
Contaminant Test Results
2 contaminants above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
Copper (90th percentile) | 1.40 mg/L | 1.30 mg/L | Over Limit |
Lead (90th percentile) | 0.002 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
Frequently Asked Questions About LYON-SIOUX RWS-ROCK RAPIDS
Is LYON-SIOUX RWS-ROCK RAPIDS water safe to drink?
LYON-SIOUX RWS-ROCK RAPIDS water receives a grade of A (84/100), which is considered excellent. Out of 2 contaminants tested, 1 exceed EPA legal limits. 2 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has LYON-SIOUX RWS-ROCK RAPIDS detected?
2 contaminants were tested in LYON-SIOUX RWS-ROCK RAPIDS's water. Notable contaminants include Copper (90th percentile), Lead (90th percentile). 1 exceed EPA legal limits (MCLs). 2 exceed EPA health goals (MCLGs).
Does LYON-SIOUX RWS-ROCK RAPIDS have any EPA violations?
Yes, LYON-SIOUX RWS-ROCK RAPIDS has 1 EPA violation(s) on record, with the most recent in 2007. Violation types include MCL. 1 are health-based violations.
How many people does LYON-SIOUX RWS-ROCK RAPIDS serve?
LYON-SIOUX RWS-ROCK RAPIDS serves approximately 1,187 people, Iowa. The system provides water to 1 community: Rock Rapids.
What type of water does LYON-SIOUX RWS-ROCK RAPIDS provide?
LYON-SIOUX RWS-ROCK RAPIDS sources its water from purchased groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is IA6000800.
How does LYON-SIOUX RWS-ROCK RAPIDS compare to other utilities in Iowa?
LYON-SIOUX RWS-ROCK RAPIDS scores 84/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Iowa state page for a full comparison of water systems.