Public water system record
Dedham Water Supply
Serves Dedham, Carroll County, IA · 221 people served
Federal records show 8 health-based violations and 27 monitoring/reporting issues for Dedham Water Supply in the last ten years. The most serious issue in this window was a resolved Selenium violation.
System profile
- Health-based violations, last 10 years
- 8
- Resolved
- 8
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 27
Key facts
- Dedham Water Supply buys its water from West Central Rwa - Nish System.
- Highest measured level in the last 10 years: Selenium, 0.07 mg/L, federal limit 0.05 mg/L (1.4 times the limit), 2020.
- Most recent formal enforcement: compliance order (no penalty) by Iowa, August 2020.
- Record on file since 1991, with 4 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 2 unknown out of 152 service lines.
Check whether Dedham Water Supply 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.
| Contaminant | Rule family | Start date | Status | Acute |
|---|---|---|---|---|
|
Selenium
Contaminant limit exceeded
Measured 0.06 mg/L, federal limit 0.05 mg/L (1.2 times the limit)
|
330 | Oct 1, 2020 | Resolved | No |
|
Selenium
Contaminant limit exceeded
Measured 0.06 mg/L, federal limit 0.05 mg/L (1.2 times the limit)
|
330 | Jul 1, 2020 | Resolved | No |
|
Selenium
Contaminant limit exceeded
Measured 0.07 mg/L, federal limit 0.05 mg/L (1.4 times the limit)
|
330 | Apr 1, 2020 | Resolved | No |
|
Selenium
Contaminant limit exceeded
Measured 0.07 mg/L, federal limit 0.05 mg/L (1.4 times the limit)
|
330 | Jan 1, 2020 | Resolved | No |
|
Selenium
Contaminant limit exceeded
Measured 0.07 mg/L, federal limit 0.05 mg/L (1.4 times the limit)
|
330 | Oct 1, 2019 | Resolved | No |
|
Selenium
Contaminant limit exceeded
Measured 0.06 mg/L, federal limit 0.05 mg/L (1.2 times the limit)
|
330 | Jul 1, 2019 | Resolved | No |
|
Selenium
Contaminant limit exceeded
Measured 0.06 mg/L, federal limit 0.05 mg/L (1.2 times the limit)
|
330 | Apr 1, 2019 | Resolved | No |
|
Selenium
Contaminant limit exceeded
Measured 0.06 mg/L, federal limit 0.05 mg/L (1.2 times the limit)
|
330 | Oct 1, 2016 | Resolved | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Aug 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Aug 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2025 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jun 1, 2025 | Active |
|
Lead and Copper Rule
Monitoring and reporting
|
Oct 1, 2024 | Active |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Aug 1, 2023 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Aug 1, 2023 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2023 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Jun 1, 2023 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Sep 1, 2022 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Aug 1, 2022 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Aug 1, 2022 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2022 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Mar 1, 2022 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Aug 1, 2021 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Aug 1, 2021 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2021 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2020 | Active |
|
Public Notice
OTHER
|
Feb 2, 2020 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2019 | Resolved |
|
Public Notice
OTHER
|
Jun 20, 2019 | Resolved |
|
Public Notice
OTHER
|
Jun 3, 2019 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Dec 1, 2018 | Active |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2018 | Resolved |
|
Selenium
Monitoring and reporting
|
Jan 1, 2018 | Resolved |
|
Public Notice
OTHER
|
Nov 2, 2017 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2016 | Resolved |
Full record since 1991
EPA's records for Dedham Water Supply go back to 1991. Before October 19, 2016 they list 4 health-based violations (4 resolved) and 10 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 0 | 5 |
| 2000s | 3 | 2 |
| 2010 to October 18, 2016 | 1 | 3 |
| October 19, 2016 to 2019 | 3 | 7 |
| 2020s | 4 | 19 |
Most recent health-based violation before October 19, 2016: Selenium, began October 2016, Resolved.
Show all 4 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Selenium
Contaminant limit exceeded
Measured 0.06 mg/L, federal limit 0.05 mg/L (1.2 times the limit)
|
Oct 1, 2016 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 2009 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Jan 1, 2008 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Oct 1, 2007 | Resolved |
Enforcement actions
Iowa regulators took 5 formal enforcement actions against Dedham Water Supply between 2007 and 2020, filed as 23 records in EPA's data. The most recent was a compliance order (no penalty) in August 2020.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Aug 17, 2020 | Iowa | Compliance order (no penalty) | 7 violations (7 health-based): Selenium |
| Feb 14, 2020 | Iowa | Compliance order (no penalty) | 7 violations (7 health-based): Selenium |
| Jan 7, 2020 | Iowa | Compliance order (no penalty) | 7 violations (7 health-based): Selenium |
| Jan 17, 2008 | Iowa | Signed compliance agreement | 1 violation (1 health-based): Nitrate |
| Oct 29, 2007 | Iowa | Signed compliance agreement | 1 violation: Haloacetic Acids (HAA5) |
What the violations mean
Selenium
8 incidentsTest results for Selenium were above the federal limit (a maximum contaminant level violation).
The utility had to notify customers about each of these violations.
Where the water comes from
Dedham Water Supply buys its water from West Central Rwa - Nish System. It lists no wells or intakes of its own.
Buys water from
- West Central Rwa - Nish System Manning, IA
Annual water quality report
Dedham Water Supply 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 500 or fewer people may meet the rule by telling customers the report is available on request, so you may need to ask Dedham Water Supply for a copy.
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