Public water system record
Highlands Mutual Water Company
Serves Clearlake, Lake County, CA · 7,772 people served
Federal records show 4 health-based violations and 1 monitoring/reporting issue for Highlands Mutual Water Company in the last ten years. The most serious issue in this window was a resolved Haloacetic Acids (HAA5) violation.
System profile
- Health-based violations, last 10 years
- 4
- Resolved
- 4
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 1
Key facts
- Highlands Mutual Water Company draws water from 1 surface water intake.
- Highest measured level in the last 10 years: Haloacetic Acids (HAA5), 0.064 mg/L, federal limit 0.06 mg/L (1.1 times the limit), 2021.
- Most recent formal enforcement: compliance order (no penalty) by California, April 2021.
- Record on file since 2015, with 1 health-based violation before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 2,355 service lines.
Check whether Highlands Mutual Water Company 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 |
|---|---|---|---|---|
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
|
220 | Apr 1, 2021 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 0.064 mg/L, federal limit 0.06 mg/L (1.1 times the limit)
|
220 | Jan 1, 2021 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 61.4 µg/L, federal limit 60 µg/L (at or just above the limit)
|
220 | Apr 1, 2019 | Resolved | No |
|
Haloacetic Acids (HAA5)
Contaminant limit exceeded
Measured 61 µg/L, federal limit 60 µg/L (at or just above the limit)
|
220 | Jan 1, 2019 | Resolved | No |
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
|
Oct 1, 2019 | Resolved |
Full record since 2015
EPA's records for Highlands Mutual Water Company go back to 2015. Before October 19, 2016 they list 1 health-based violation (1 resolved) and no monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 2010 to October 18, 2016 | 1 | 0 |
| October 19, 2016 to 2019 | 2 | 1 |
| 2020s | 2 | 0 |
Most recent health-based violation before October 19, 2016: Total Trihalomethanes (TTHMs), began October 2015, Resolved.
Show the health-based violation before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Trihalomethanes (TTHMs)
Contaminant limit exceeded
Measured 81.7 µg/L, federal limit 80 µg/L (at or just above the limit)
|
Oct 1, 2015 | Resolved |
Enforcement actions
California regulators took 4 formal enforcement actions against Highlands Mutual Water Company between 2016 and 2021. The most recent was a compliance order (no penalty) in April 2021.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Apr 12, 2021 | California | Compliance order (no penalty) | 2 violations (2 health-based): Haloacetic Acids (HAA5) |
| Feb 11, 2020 | California | Compliance order (no penalty) | 1 violation: Lead and Copper Rule |
| Jun 18, 2019 | California | Compliance order (no penalty) | 2 violations (2 health-based): Haloacetic Acids (HAA5) |
| May 9, 2016 | California | Compliance order (no penalty) | 1 violation (1 health-based): Total Trihalomethanes (TTHMs) |
What the violations mean
Haloacetic Acids (HAA5)
4 incidentsHaloacetic acid byproducts exceeded the federal limit
Long-term exposure to HAAs may increase cancer risk
Where the water comes from
Highlands Mutual Water Company draws water from 1 surface water intake. It also has emergency connections to Konocti County Water District and Golden State Water Co.-Clearlake System. 2 other public water systems have emergency connections to Highlands Mutual Water Company.
Emergency or part-time connections to
- Konocti County Water District Clearlake, CA
- Golden State Water Co.-Clearlake System Rancho Cordova, CA
Annual water quality report
Highlands Mutual Water Company 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 California.
Certified drinking water labs by state EPA guidance for private wells