Public water system record
Keystone Water Supply
Serves Keystone, Benton County, IA · 599 people served
Federal records show 4 health-based violations and 2 monitoring/reporting issues for Keystone Water Supply in the last ten years. The most serious issue in this window was a resolved Groundwater Rule violation.
System profile
- Health-based violations, last 10 years
- 4
- Resolved
- 4
- Unresolved
- 0
- Any acute record
- Yes
- Monitoring issues, last 10 years
- 2
Key facts
- Keystone Water Supply draws water from 1 well.
- Highest measured level in the last 10 years: Nitrite, 1.83 mg/L, federal limit 1 mg/L (1.8 times the limit), 2018.
- Record on file since 1988, with 3 health-based violations before October 19, 2016.
- Lead pipe inventory: 3 lead and 1 unknown out of 297 service lines.
Check whether Keystone 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 |
|---|---|---|---|---|
|
Groundwater Rule
Treatment technique failure
|
140 | May 1, 2021 | Resolved | No |
|
Nitrite
Contaminant limit exceeded
Measured 1.15 mg/L, federal limit 1 mg/L (1.2 times the limit)
|
330 | Apr 1, 2021 | Resolved | Yes |
|
Nitrite
Contaminant limit exceeded
Measured 1.26 mg/L, federal limit 1 mg/L (1.3 times the limit)
|
330 | Nov 1, 2020 | Resolved | Yes |
|
Nitrite
Contaminant limit exceeded
Measured 1.83 mg/L, federal limit 1 mg/L (1.8 times the limit)
|
330 | Sep 1, 2018 | Resolved | Yes |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Lead and Copper Rule
Monitoring and reporting
|
Dec 1, 2018 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jul 1, 2018 | Resolved |
Full record since 1988
EPA's records for Keystone Water Supply go back to 1988. Before October 19, 2016 they list 3 health-based violations (3 resolved) and 23 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1980s | 0 | 7 |
| 1990s | 0 | 3 |
| 2000s | 2 | 0 |
| 2010 to October 18, 2016 | 1 | 13 |
| October 19, 2016 to 2019 | 1 | 2 |
| 2020s | 3 | 0 |
Most recent health-based violation before October 19, 2016: Nitrite (acute), began September 2011, Resolved.
Show all 3 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Nitrite (acute)
Contaminant limit exceeded
Measured 1.65 mg/L, federal limit 1 mg/L (1.7 times the limit)
|
Sep 1, 2011 | Resolved |
|
Nitrite (acute)
Contaminant limit exceeded
|
Jun 1, 2005 | Resolved |
|
Nitrite (acute)
Contaminant limit exceeded
|
Jun 1, 2004 | Resolved |
What the violations mean
Nitrite
3 incidentsNitrite exceeded the federal limit
High nitrite is especially dangerous for infants under 6 months
Groundwater Rule
1 incidentThe system did not complete a treatment step or action that the Groundwater Rule requires (a treatment technique violation).
The utility had to notify customers about this violation.
Where the water comes from
Keystone Water Supply draws water from 1 well.
Annual water quality report
Keystone 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.
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 Iowa.
Certified drinking water labs by state EPA guidance for private wells