A83/100
GRAIN VALLEY PWS — Water Quality Report 2026
Serving 16,000 people · Missouri
Water Source
Purchased Groundwater
County
—
System ID
MO1010320
Violations
10
Contaminant Test Results
1 contaminant above EPA health goals
| Contaminant | Detected | Limit (MCL) | Status |
|---|---|---|---|
chlorate | 324.00 µg/L | — | Above Goal |
EPA Violation History
No violations in the past 5 years
Full EPA compliance since 2015.
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 GRAIN VALLEY PWS
Is GRAIN VALLEY PWS water safe to drink?
GRAIN VALLEY PWS water receives a grade of A (83/100), which is considered excellent. Out of 66 contaminants tested, none exceed EPA legal limits. 1 contaminant(s) exceed non-enforceable health goals. The water meets federal safety standards.
What contaminants has GRAIN VALLEY PWS detected?
66 contaminants were tested in GRAIN VALLEY PWS's water. Notable contaminants include chlorate. No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).
Does GRAIN VALLEY PWS have any EPA violations?
Yes, GRAIN VALLEY PWS has 10 EPA violation(s) on record, with the most recent in 2015. Violation types include MCL, MR, Other. 1 are health-based violations.
How many people does GRAIN VALLEY PWS serve?
GRAIN VALLEY PWS serves approximately 16,000 people, Missouri. The system provides water to 1 community: Grain Valley.
What type of water does GRAIN VALLEY PWS provide?
GRAIN VALLEY PWS sources its water from purchased groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is MO1010320.
How does GRAIN VALLEY PWS compare to other utilities in Missouri?
GRAIN VALLEY PWS scores 83/100 with a grade of A (excellent). This places it among the higher-performing utilities in the state. Visit our Missouri state page for a full comparison of water systems.