Public water system record
Mason City Water Department
Serves Mason City, Cerro Gordo County, IA · 27,338 people served
Federal records show no health-based violations and 1 monitoring/reporting issue for Mason City Water Department 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
- 1
Key facts
- Mason City Water Department draws water from 9 wells.
- Most recent formal enforcement: signed compliance agreement by Iowa, March 2002.
- Record on file since 1980, with 18 health-based violations before October 19, 2016.
- Lead pipe inventory: 2,322 lead and 713 unknown out of 13,320 service lines.
Check whether Mason City Water Department 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 |
|---|---|---|
|
Revised Total Coliform Rule
Monitoring violation
|
Jun 1, 2024 | Resolved |
Full record since 1980
EPA's records for Mason City Water Department go back to 1980. Before October 19, 2016 they list 18 health-based violations (13 resolved, 5 archived by EPA without a recorded fix) and 123 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1980s | 4 | 5 |
| 1990s | 1 | 100 |
| 2000s | 12 | 18 |
| 2010 to October 18, 2016 | 1 | 0 |
| 2020s | 0 | 1 |
Most recent health-based violation before October 19, 2016: Total Coliform, began August 2012, Resolved.
Show all 18 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Coliform
Contaminant limit exceeded
|
Aug 1, 2012 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jun 1, 2008 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Oct 1, 2004 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Aug 1, 2004 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Jul 1, 2004 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Mar 1, 2004 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Jan 1, 2004 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Jul 1, 2003 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Apr 1, 2003 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Jan 1, 2003 | Archived |
|
Total Coliform
Contaminant limit exceeded
|
Jan 1, 2003 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Oct 1, 2002 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Jan 1, 2000 | Archived |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Jul 1, 1993 | Resolved |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Oct 1, 1985 | Archived |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Apr 1, 1985 | Archived |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Sep 18, 1980 | Archived |
|
Combined Radium (-226 and -228)
Contaminant limit exceeded
|
Apr 1, 1980 | Resolved |
Enforcement actions
Iowa regulators took 3 formal enforcement actions against Mason City Water Department between 1985 and 2002, filed as 4 records in EPA's data. The most recent was a signed compliance agreement in March 2002.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Mar 25, 2002 | Iowa | Signed compliance agreement | 1 violation: Combined Radium (-226 and -228) |
| Sep 30, 1986 | Iowa | Signed compliance agreement | 1 violation (1 health-based): Combined Radium (-226 and -228) |
| Sep 20, 1985 | Iowa | Signed compliance agreement | 2 violations (2 health-based): Combined Radium (-226 and -228) |
Where the water comes from
Mason City Water Department draws water from 9 wells.
Annual water quality report
Mason City Water Department 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 Iowa.
Certified drinking water labs by state EPA guidance for private wells