Public water system record
Potosi PWS
Serves Potosi, Washington County, MO · 2,527 people served
Federal records show no health-based violations and 2 monitoring/reporting issues for Potosi PWS 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
- 2
Key facts
- Potosi PWS draws water from 5 wells (1 of them for emergency, seasonal or other part-time use).
- Most recent formal enforcement: signed compliance agreement by Missouri, October 2007.
- Record on file since 1981, with 79 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 1,531 unknown out of 1,531 service lines.
Check whether Potosi PWS 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.
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Public Notice
OTHER
|
Apr 27, 2024 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Mar 1, 2023 | Resolved |
Full record since 1981
EPA's records for Potosi PWS go back to 1981. Before October 19, 2016 they list 79 health-based violations (52 resolved, 27 archived by EPA without a recorded fix) and 10 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1980s | 2 | 0 |
| 1990s | 12 | 3 |
| 2000s | 54 | 3 |
| 2010 to October 18, 2016 | 11 | 4 |
| 2020s | 0 | 2 |
Most recent health-based violation before October 19, 2016: Total Coliform, began December 2015, Resolved.
Show all 79 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Coliform
Contaminant limit exceeded
|
Dec 1, 2015 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 2015 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Nov 1, 2014 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jun 1, 2013 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Oct 1, 2012 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Aug 1, 2012 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Apr 1, 2012 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 2011 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jul 1, 2011 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Apr 1, 2011 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jul 1, 2010 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jul 1, 2008 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
May 1, 2008 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 12.8 pCi/L, federal limit 5 pCi/L (2.6 times the limit)
|
Apr 1, 2007 | Resolved |
|
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
Measured 17.25 pCi/L, federal limit 15 pCi/L (1.2 times the limit)
|
Apr 1, 2007 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 18.2 pCi/L, federal limit 5 pCi/L (3.6 times the limit)
|
Jan 1, 2007 | Resolved |
|
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
Measured 24.3 pCi/L, federal limit 15 pCi/L (1.6 times the limit)
|
Jan 1, 2007 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Dec 1, 2006 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Nov 1, 2006 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Oct 1, 2006 | Resolved |
|
Total Coliform (acute)
Contaminant limit exceeded
|
Aug 1, 2006 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Aug 1, 2006 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 27.35 pCi/L, federal limit 5 pCi/L (5.5 times the limit)
|
Apr 1, 2006 | Resolved |
|
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
Measured 30.6 pCi/L, federal limit 15 pCi/L (2 times the limit)
|
Apr 1, 2006 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Apr 1, 2006 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Feb 1, 2006 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 27.43 pCi/L, federal limit 5 pCi/L (5.5 times the limit)
|
Jan 1, 2006 | Resolved |
|
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
Measured 36.4 pCi/L, federal limit 15 pCi/L (2.4 times the limit)
|
Jan 1, 2006 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Nov 1, 2005 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 27.43 pCi/L, federal limit 5 pCi/L (5.5 times the limit)
|
Oct 1, 2005 | Resolved |
|
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
Measured 36.4 pCi/L, federal limit 15 pCi/L (2.4 times the limit)
|
Oct 1, 2005 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 27.6 pCi/L, federal limit 5 pCi/L (5.5 times the limit)
|
Jul 1, 2005 | Resolved |
|
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
Measured 44.4 pCi/L, federal limit 15 pCi/L (3 times the limit)
|
Jul 1, 2005 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Apr 1, 2005 | Resolved |
|
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
|
Apr 1, 2005 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
Measured 26.8 pCi/L, federal limit 5 pCi/L (5.4 times the limit)
|
Jan 1, 2005 | Resolved |
|
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
Measured 43.8 pCi/L, federal limit 15 pCi/L (2.9 times the limit)
|
Jan 1, 2005 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Oct 1, 2004 | Archived |
|
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
|
Oct 1, 2004 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Jul 1, 2004 | Archived |
|
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
|
Jul 1, 2004 | Archived |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Apr 1, 2004 | Archived |
|
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
|
Apr 1, 2004 | Archived |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Jan 1, 2004 | Archived |
|
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
|
Jan 1, 2004 | Archived |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Oct 1, 2003 | Archived |
|
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
|
Oct 1, 2003 | Archived |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 2003 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Jul 1, 2003 | Archived |
|
Gross Alpha, Excl. Radon and U
Contaminant limit exceeded
|
Jul 1, 2003 | Archived |
29 older violations are not listed here. EPA ECHO has the complete list.
Enforcement actions
Missouri regulators took 3 formal enforcement actions against Potosi PWS and issued 1 boil water order between 2005 and 2007. The most recent was a signed compliance agreement in October 2007.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Oct 29, 2007 | Missouri | Signed compliance agreement | 14 violations (14 health-based): Gross Alpha, Excl. Radon and U, Combined Radium (-226 and -228) |
| Aug 4, 2006 | Missouri | Boil water order | 2 violations (2 health-based): Total Coliform |
| May 5, 2006 | Missouri | Signed compliance agreement | 5 violations (5 health-based): Total Coliform, Combined Radium (-226 and -228) |
| Nov 22, 2005 | Missouri | Signed compliance agreement | 39 violations (39 health-based): Combined Radium (-226 and -228), Gross Alpha, Excl. Radon and U |
Where the water comes from
Potosi PWS draws water from 5 wells (1 of them for emergency, seasonal or other part-time use). 1 other community water system buys water from Potosi PWS.
Community systems that buy water from it
- Washington County PWSD 1 Potosi, MO
Annual water quality report
Potosi PWS 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.
Where the state allows it, systems serving fewer than 10,000 people may publish the report in a local newspaper or news site instead of mailing it, and must provide a copy on request.
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