Public water system record
Rancho Santa Teresa MW Co.
Serves an area of San Diego County, CA · 102 people served
Federal records show 17 health-based violations and 48 monitoring/reporting issues for Rancho Santa Teresa MW Co. in the last ten years. The most serious issue in this window was a Nitrate violation that EPA lists as archived, not resolved.
System profile
Source water
Groundwater
ZIP
92065
EPA system ID
CA3700918
- Health-based violations, last 10 years
- 17
- Resolved
- 14
- Unresolved
- 0
- Archived by EPA
- 3
- Any acute record
- Yes
- Monitoring issues, last 10 years
- 48
Key facts
- Rancho Santa Teresa MW Co. draws water from 2 wells.
- Highest measured level in the last 10 years: Nitrate, 13 mg/L, federal limit 10 mg/L (1.3 times the limit), 2023.
- Most recent formal enforcement: compliance order (no penalty) by California, October 2023.
- Record on file since 1980, with 20 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 39 service lines.
Check whether Rancho Santa Teresa MW Co. 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 |
|---|---|---|---|---|
|
Nitrate
Contaminant limit exceeded
Measured 11 mg/L, federal limit 10 mg/L (1.1 times the limit)
|
330 | Oct 1, 2024 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 13 mg/L, federal limit 10 mg/L (1.3 times the limit)
|
330 | Oct 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11 mg/L, federal limit 10 mg/L (1.1 times the limit)
|
330 | Jul 1, 2023 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Combined Uranium
Contaminant limit exceeded
|
340 | Apr 1, 2019 | Resolved | No |
|
Combined Uranium
Contaminant limit exceeded
|
340 | Apr 1, 2019 | Resolved | No |
|
Combined Uranium
Contaminant limit exceeded
|
340 | Jan 1, 2019 | Resolved | No |
|
Combined Uranium
Contaminant limit exceeded
|
340 | Jan 1, 2019 | Resolved | No |
|
Combined Uranium
Contaminant limit exceeded
|
340 | Oct 1, 2018 | Resolved | No |
|
Combined Uranium
Contaminant limit exceeded
|
340 | Oct 1, 2018 | Resolved | No |
|
Nitrate
Contaminant limit exceeded
Measured 10.5 mg/L, federal limit 10 mg/L (1.1 times the limit)
|
330 | Jul 1, 2018 | Resolved | Yes |
|
Combined Uranium
Contaminant limit exceeded
|
340 | Apr 1, 2018 | Resolved | No |
|
Combined Uranium
Contaminant limit exceeded
|
340 | Jan 1, 2018 | Resolved | No |
|
Combined Uranium
Contaminant limit exceeded
|
340 | Oct 1, 2017 | Resolved | No |
|
Combined Uranium
Contaminant limit exceeded
|
340 | Jul 1, 2017 | Resolved | No |
|
Combined Uranium
Contaminant limit exceeded
|
340 | Apr 1, 2017 | Resolved | No |
|
Combined Uranium
Contaminant limit exceeded
|
340 | Jan 1, 2017 | Resolved | No |
|
Combined Uranium
Contaminant limit exceeded
|
340 | Oct 1, 2016 | Resolved | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Public Notice
OTHER
|
Aug 29, 2023 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Jul 1, 2022 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Jun 1, 2022 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Revised Total Coliform Rule
Monitoring violation
|
May 1, 2022 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Nitrate
Monitoring and reporting
|
Apr 1, 2022 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Apr 1, 2022 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Feb 1, 2022 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Jan 1, 2022 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Oct 1, 2021 | Resolved |
|
Lead and Copper Rule
Monitoring and reporting
|
Oct 1, 2021 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jul 1, 2021 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Jul 1, 2021 | Resolved |
|
Nitrate
Monitoring and reporting
|
Apr 1, 2021 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Apr 1, 2021 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Jan 1, 2021 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jan 1, 2021 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Oct 1, 2020 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Aug 1, 2020 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Jul 1, 2020 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Jun 1, 2020 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Apr 1, 2020 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Jun 1, 2019 | Resolved |
|
Nitrate
Monitoring and reporting
|
Apr 1, 2019 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jan 1, 2019 | Resolved |
|
Nitrate
Monitoring and reporting
|
Apr 1, 2018 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jan 1, 2018 | Resolved |
|
Nitrate
Monitoring and reporting
|
Jul 1, 2017 | Resolved |
|
Styrene
Monitoring and reporting
|
Jan 1, 2016 | Resolved |
|
Ethylbenzene
Monitoring and reporting
|
Jan 1, 2016 | Resolved |
|
Toluene
Monitoring and reporting
|
Jan 1, 2016 | Resolved |
|
Benzene
Monitoring and reporting
|
Jan 1, 2016 | Resolved |
|
CHLOROBENZENE
Monitoring and reporting
|
Jan 1, 2016 | Resolved |
|
Tetrachloroethylene
Monitoring and reporting
|
Jan 1, 2016 | Resolved |
|
1,1,2-Trichloroethane
Monitoring and reporting
|
Jan 1, 2016 | Resolved |
|
Trichloroethylene
Monitoring and reporting
|
Jan 1, 2016 | Resolved |
|
1,2-Dichloropropane
Monitoring and reporting
|
Jan 1, 2016 | Resolved |
|
Carbon tetrachloride
Monitoring and reporting
|
Jan 1, 2016 | Resolved |
|
1,1,1-Trichloroethane
Monitoring and reporting
|
Jan 1, 2016 | Resolved |
|
1,2-Dichloroethane
Monitoring and reporting
|
Jan 1, 2016 | Resolved |
|
trans-1,2-Dichloroethylene
Monitoring and reporting
|
Jan 1, 2016 | Resolved |
|
1,1-Dichloroethylene
Monitoring and reporting
|
Jan 1, 2016 | Resolved |
|
Vinyl chloride
Monitoring and reporting
|
Jan 1, 2016 | Resolved |
|
p-Dichlorobenzene
Monitoring and reporting
|
Jan 1, 2016 | Resolved |
|
o-Dichlorobenzene
Monitoring and reporting
|
Jan 1, 2016 | Resolved |
|
DICHLOROMETHANE
Monitoring and reporting
|
Jan 1, 2016 | Resolved |
|
Xylenes, Total
Monitoring and reporting
|
Jan 1, 2016 | Resolved |
|
cis-1,2-Dichloroethylene
Monitoring and reporting
|
Jan 1, 2016 | Resolved |
|
1,2,4-Trichlorobenzene
Monitoring and reporting
|
Jan 1, 2016 | Resolved |
Full record since 1980
EPA's records for Rancho Santa Teresa MW Co. go back to 1980. Before October 19, 2016 they list 20 health-based violations (20 resolved) and 35 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1980s | 0 | 11 |
| 1990s | 0 | 1 |
| 2000s | 7 | 2 |
| 2010 to October 18, 2016 | 13 | 21 |
| October 19, 2016 to 2019 | 13 | 6 |
| 2020s | 3 | 21 |
Most recent health-based violation before October 19, 2016: Combined Uranium, began October 2016, Resolved.
Show all 20 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Combined Uranium
Contaminant limit exceeded
|
Oct 1, 2016 | Resolved |
|
Combined Uranium
Contaminant limit exceeded
|
Jul 1, 2016 | Resolved |
|
Combined Uranium
Contaminant limit exceeded
|
Apr 1, 2016 | Resolved |
|
Combined Uranium
Contaminant limit exceeded
|
Jan 1, 2016 | Resolved |
|
Combined Uranium
Contaminant limit exceeded
|
Oct 1, 2015 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Aug 1, 2015 | Resolved |
|
Combined Uranium
Contaminant limit exceeded
|
Jul 1, 2015 | Resolved |
|
Combined Uranium
Contaminant limit exceeded
|
Apr 1, 2015 | Resolved |
|
Total Coliform (acute)
Contaminant limit exceeded
|
Apr 1, 2015 | Resolved |
|
Combined Uranium
Contaminant limit exceeded
|
Jan 1, 2015 | Resolved |
|
Combined Uranium
Contaminant limit exceeded
|
Oct 1, 2014 | Resolved |
|
Combined Uranium
Contaminant limit exceeded
|
Jul 1, 2014 | Resolved |
|
Combined Uranium
Contaminant limit exceeded
|
Apr 1, 2014 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Nov 1, 2008 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jul 1, 2008 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Oct 1, 2007 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jan 1, 2007 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 2006 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jul 1, 2005 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Mar 1, 2005 | Resolved |
Enforcement actions
California regulators took 17 formal enforcement actions against Rancho Santa Teresa MW Co. and issued 2 boil water orders between 2005 and 2023. The most recent was a compliance order (no penalty) in October 2023.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Oct 10, 2023 | California | Compliance order (no penalty) | 4 violations (3 health-based): Nitrate, Public Notice |
| Dec 13, 2022 | California | Compliance order with a penalty | 46 violations: 1,2-Dichloroethane, 1,1,1-Trichloroethane, 1,1,2-Trichloroethane, Tetrachloroethylene, Nitrate |
| Dec 26, 2018 | California | Compliance order with a penalty | 8 violations (7 health-based): Combined Uranium, Nitrate, Revised Total Coliform Rule |
| Jun 30, 2017 | California | Compliance order (no penalty) | 11 violations (11 health-based): Combined Uranium |
| Aug 8, 2015 | California | Compliance order (no penalty) | 1 violation (1 health-based): Total Coliform |
| Apr 9, 2015 | California | Compliance order (no penalty) | 1 violation (1 health-based): Total Coliform |
| Feb 5, 2015 | California | Compliance order (no penalty) | 1 violation (1 health-based): Combined Uranium |
| Jan 1, 2015 | California | Compliance order (no penalty) | 9 violations (9 health-based): Combined Uranium |
| Nov 14, 2014 | California | Compliance order (no penalty) | 1 violation (1 health-based): Combined Uranium |
| Aug 12, 2014 | California | Compliance order (no penalty) | 1 violation (1 health-based): Combined Uranium |
| Mar 11, 2009 | California | Compliance order (no penalty) | 1 violation: Total Coliform |
| Nov 20, 2008 | California | Compliance order (no penalty) | 1 violation (1 health-based): Total Coliform |
| Jul 23, 2008 | California | Compliance order (no penalty) | 1 violation (1 health-based): Total Coliform |
| Jul 15, 2008 | California | Compliance order (no penalty) | 1 violation: Total Coliform |
| Oct 27, 2007 | California | Boil water order | 1 violation (1 health-based): Total Coliform |
| Feb 6, 2007 | California | Compliance order (no penalty) | 1 violation (1 health-based): Total Coliform |
| Sep 14, 2006 | California | Boil water order | 1 violation (1 health-based): Total Coliform |
| Sep 12, 2005 | California | Compliance order (no penalty) | 1 violation (1 health-based): Total Coliform |
| Apr 10, 2005 | California | Compliance order (no penalty) | 1 violation (1 health-based): Total Coliform |
What the violations mean
Combined Uranium
13 incidentsTest results for Combined Uranium were above the federal limit (a maximum contaminant level violation).
The utility had to notify customers about each of these violations.
Nitrate
4 incidentsNitrate exceeded the federal limit
High nitrate is especially dangerous for infants under 6 months and can cause blue baby syndrome
Where the water comes from
Rancho Santa Teresa MW Co. draws water from 2 wells.
Annual water quality report
Rancho Santa Teresa MW Co. 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 Rancho Santa Teresa MW Co. 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