Public water system record
Rim Rock Water Company
Serves an area of San Luis Obispo County, CA · 55 people served
Federal records show 31 health-based violations and 2 monitoring/reporting issues for Rim Rock Water Company in the last ten years. The most serious issue in this window was a resolved Arsenic violation.
System profile
- Health-based violations, last 10 years
- 31
- Resolved
- 31
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 2
Key facts
- Rim Rock Water Company draws water from 2 wells.
- Highest measured level in the last 10 years: Arsenic, 163 µg/L, federal limit 10 µg/L (16 times the limit), 2024.
- Most recent formal enforcement: compliance order (no penalty) by California, January 2024.
- Record on file since 1993, with 0 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 25 service lines.
Check whether Rim Rock 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 |
|---|---|---|---|---|
|
Arsenic
Contaminant limit exceeded
Measured 40 µg/L, federal limit 10 µg/L (4 times the limit)
|
330 | Apr 1, 2025 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 40 µg/L, federal limit 10 µg/L (4 times the limit)
|
330 | Jan 1, 2025 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 64 µg/L, federal limit 10 µg/L (6.4 times the limit)
|
330 | Oct 1, 2024 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 163 µg/L, federal limit 10 µg/L (16 times the limit)
|
330 | Jul 1, 2024 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 62 µg/L, federal limit 10 µg/L (6.2 times the limit)
|
330 | Apr 1, 2024 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 136 µg/L, federal limit 10 µg/L (14 times the limit)
|
330 | Jan 1, 2024 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 136 µg/L, federal limit 10 µg/L (14 times the limit)
|
330 | Jan 1, 2024 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
|
330 | Jul 1, 2023 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
|
330 | Apr 1, 2023 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
|
330 | Jan 1, 2023 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 136 µg/L, federal limit 10 µg/L (14 times the limit)
|
330 | Oct 1, 2022 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 136 µg/L, federal limit 10 µg/L (14 times the limit)
|
330 | Jul 1, 2022 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
|
330 | Apr 1, 2022 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
|
330 | Jan 1, 2022 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 27 µg/L, federal limit 10 µg/L (2.7 times the limit)
|
330 | Oct 1, 2021 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 56 µg/L, federal limit 10 µg/L (5.6 times the limit)
|
330 | Jul 1, 2021 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 56 µg/L, federal limit 10 µg/L (5.6 times the limit)
|
330 | Apr 1, 2021 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 56 µg/L, federal limit 10 µg/L (5.6 times the limit)
|
330 | Jan 1, 2021 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 61 µg/L, federal limit 10 µg/L (6.1 times the limit)
|
330 | Oct 1, 2020 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 85 µg/L, federal limit 10 µg/L (8.5 times the limit)
|
330 | Jul 1, 2020 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 28 µg/L, federal limit 10 µg/L (2.8 times the limit)
|
330 | Apr 1, 2020 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 28 µg/L, federal limit 10 µg/L (2.8 times the limit)
|
330 | Jan 1, 2020 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 25 µg/L, federal limit 10 µg/L (2.5 times the limit)
|
330 | Oct 1, 2019 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 42 µg/L, federal limit 10 µg/L (4.2 times the limit)
|
330 | Jul 1, 2019 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
|
330 | Apr 1, 2019 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
|
330 | Jan 1, 2019 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.098 mg/L, federal limit 0.01 mg/L (9.8 times the limit)
|
330 | Oct 1, 2018 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.098 mg/L, federal limit 0.01 mg/L (9.8 times the limit)
|
330 | Jul 1, 2018 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.098 mg/L, federal limit 0.01 mg/L (9.8 times the limit)
|
330 | Apr 1, 2018 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.105 mg/L, federal limit 0.01 mg/L (11 times the limit)
|
330 | Jan 1, 2018 | Resolved | No |
|
Arsenic
Contaminant limit exceeded
Measured 0.097 mg/L, federal limit 0.01 mg/L (9.7 times the limit)
|
330 | Oct 1, 2017 | Resolved | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Nitrate
Monitoring and reporting
|
Jan 1, 2023 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jan 1, 2019 | Resolved |
Full record since 1993
EPA's records for Rim Rock Water Company go back to 1993. Before October 19, 2016 they list no health-based violations and 2 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 0 | 1 |
| 2000s | 0 | 1 |
| October 19, 2016 to 2019 | 9 | 1 |
| 2020s | 22 | 1 |
Enforcement actions
California regulators took 4 formal enforcement actions against Rim Rock Water Company between 2018 and 2024. The most recent was a compliance order (no penalty) in January 2024.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Jan 29, 2024 | California | Compliance order (no penalty) | 1 violation: Nitrate |
| Jan 25, 2024 | California | Compliance order (no penalty) | 1 violation (1 health-based): Arsenic |
| Jan 29, 2020 | California | Compliance order (no penalty) | 15 violations (14 health-based): Nitrate, Arsenic |
| Mar 15, 2018 | California | Compliance order (no penalty) | 16 violations (16 health-based): Arsenic |
What the violations mean
Arsenic
31 incidentsArsenic exceeded the federal limit
Long-term arsenic exposure is linked to cancer and cardiovascular effects
Where the water comes from
Rim Rock Water Company draws water from 2 wells.
Annual water quality report
Rim Rock 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.
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 Rim Rock Water Company 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