Public water system record
Jefferson County PWSD 1
Serves Arnold, Jefferson County, MO · 21,113 people served
Federal records show no health-based violations and no monitoring or reporting issues for Jefferson County PWSD 1 in the last ten years.
System profile
- Health-based violations, last 10 years
- 0
- Resolved
- 0
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 0
Key facts
- Jefferson County PWSD 1 buys its water from MO American St Louis St Charles Counties.
- Lead pipe inventory: 0 lead and 0 unknown out of 7,347 service lines.
Check whether Jefferson County PWSD 1 serves your address
Health-based violations
Since October 2016Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.
None since October 2016, and no monitoring or reporting violations either.
Where the water comes from
Jefferson County PWSD 1 buys its water from MO American St Louis St Charles Counties. It lists no wells or intakes of its own. 3 other community water systems buy water from Jefferson County PWSD 1.
Buys water from
- MO American St Louis St Charles Counties Chesterfield, MO
Community systems that buy water from it
- Jeffco MHP Charlotte, NC
- Ozark Hills MHP Arnold, MO
- Starling MHP Arnold, MO
Annual water quality report
Jefferson County PWSD 1 must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.
Systems serving 10,000 or more people must mail or deliver the report to every customer, and from 2027 they must send it twice a year.
Find a posted report with EPA's Consumer Confidence Report search
Testing your own water
To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Missouri.
Certified drinking water labs by state EPA guidance for private wells