Public water system record
Twin Knolls Fourth/Fifth Addition
Serves an area of Linn County, IA · 90 people served
Federal records show no health-based violations and 11 monitoring/reporting issues for Twin Knolls Fourth/Fifth Addition in the last ten years. At least one of these issues remains unresolved.
System profile
- Health-based violations, last 10 years
- 0
- Resolved
- 0
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 11
Key facts
- Twin Knolls Fourth/Fifth Addition draws water from 1 well.
- Record on file since 1991, with 5 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 36 service lines.
Check whether Twin Knolls Fourth/Fifth Addition 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
|
May 24, 2025 | Active |
|
Revised Total Coliform Rule
Monitoring violation
|
Jan 1, 2025 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Dec 1, 2024 | Active |
|
Public Notice
OTHER
|
May 13, 2023 | Resolved |
|
Public Notice
OTHER
|
Oct 12, 2022 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Aug 1, 2022 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Aug 1, 2022 | Resolved |
|
Public Notice
OTHER
|
Jul 13, 2022 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2022 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Dec 1, 2021 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Dec 1, 2018 | Active |
Full record since 1991
EPA's records for Twin Knolls Fourth/Fifth Addition go back to 1991. Before October 19, 2016 they list 5 health-based violations (5 resolved) and 11 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 3 | 2 |
| 2000s | 1 | 1 |
| 2010 to October 18, 2016 | 1 | 8 |
| October 19, 2016 to 2019 | 0 | 1 |
| 2020s | 0 | 10 |
Most recent health-based violation before October 19, 2016: Total Coliform, began June 2012, Resolved.
Show all 5 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Coliform
Contaminant limit exceeded
|
Jun 1, 2012 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Nov 1, 2000 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Oct 1, 1991 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Oct 1, 1991 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 1991 | Resolved |
Where the water comes from
Twin Knolls Fourth/Fifth Addition draws water from 1 well.
Annual water quality report
Twin Knolls Fourth/Fifth Addition 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 Twin Knolls Fourth/Fifth Addition 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