Public water system record
Improvement District No. 1
Serves Three Rivers, Tulare County, CA · 200 people served
Federal records show no health-based violations and 5 monitoring/reporting issues for Improvement District No. 1 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
- 5
Key facts
- Improvement District No. 1 draws water from 1 well and 1 infiltration gallery.
- Most recent formal enforcement: compliance order (no penalty) by California, December 2025.
- Record on file since 1980, with 12 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 81 unknown out of 81 service lines.
Check whether Improvement District No. 1 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 |
|---|---|---|
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Jun 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
|
Jun 1, 2025 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Revised Total Coliform Rule
Monitoring violation
|
Sep 1, 2019 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jan 1, 2017 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jan 1, 2016 | Resolved |
Full record since 1980
EPA's records for Improvement District No. 1 go back to 1980. Before October 19, 2016 they list 12 health-based violations (12 resolved) and 45 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1980s | 0 | 26 |
| 1990s | 0 | 1 |
| 2000s | 5 | 9 |
| 2010 to October 18, 2016 | 7 | 9 |
| October 19, 2016 to 2019 | 0 | 2 |
| 2020s | 0 | 2 |
Most recent health-based violation before October 19, 2016: Long Term 2 Enhanced Surface Water Treatment Rule, began March 2014, Resolved.
Show all 12 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Long Term 2 Enhanced Surface Water Treatment Rule
Treatment technique failure
|
Mar 1, 2014 | Resolved |
|
Long Term 2 Enhanced Surface Water Treatment Rule
Treatment technique failure
|
Feb 1, 2014 | Resolved |
|
Long Term 2 Enhanced Surface Water Treatment Rule
Treatment technique failure
|
Jan 1, 2014 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Oct 1, 2011 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Apr 1, 2011 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Dec 1, 2010 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Aug 1, 2010 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Oct 1, 2008 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jul 1, 2007 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Sep 1, 2006 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Jun 1, 2003 | Resolved |
|
Surface Water Treatment Rule
Treatment technique failure
|
Feb 1, 2003 | Resolved |
Enforcement actions
California regulators took 9 formal enforcement actions against Improvement District No. 1 between 2004 and 2025. The most recent was a compliance order (no penalty) in December 2025.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Dec 10, 2025 | California | Compliance order (no penalty) | 2 violations: Total Trihalomethanes (TTHMs), Haloacetic Acids (HAA5) |
| Oct 7, 2019 | California | Compliance order (no penalty) | 1 violation: Revised Total Coliform Rule |
| Feb 23, 2018 | California | Compliance order (no penalty) | 1 violation: Nitrate |
| Feb 10, 2017 | California | Compliance order (no penalty) | 1 violation: Nitrate |
| Feb 18, 2016 | California | Compliance order (no penalty) | 1 violation: Nitrate-Nitrite |
| Jun 3, 2014 | California | Compliance order (no penalty) | 3 violations (3 health-based): Long Term 2 Enhanced Surface Water Treatment Rule |
| Jan 29, 2014 | California | Compliance order (no penalty) | 1 violation: Lead and Copper Rule |
| Mar 11, 2013 | California | Compliance order (no penalty) | 1 violation (1 health-based): Surface Water Treatment Rule |
| Aug 18, 2004 | California | Compliance order (no penalty) | 4 violations: Surface Water Treatment Rule |
Where the water comes from
Improvement District No. 1 draws water from 1 well and 1 infiltration gallery.
Annual water quality report
Improvement District No. 1 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 Improvement District No. 1 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 California.
Certified drinking water labs by state EPA guidance for private wells