Public water system record
Twin Valley Inc
Serves an area of Santa Clara County, CA · 317 people served
Federal records show 54 health-based violations and 5 monitoring/reporting issues for Twin Valley Inc 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
95012
EPA system ID
CA4300575
- Health-based violations, last 10 years
- 54
- Resolved
- 0
- Unresolved
- 0
- Archived by EPA
- 54
- Any acute record
- Yes
- Monitoring issues, last 10 years
- 5
Key facts
- Twin Valley Inc draws water from 5 wells (1 of them for emergency, seasonal or other part-time use).
- Highest measured level in the last 10 years: Nitrate, 12.2 mg/L, federal limit 10 mg/L (1.2 times the limit), 2018.
- Most recent formal enforcement: compliance order (no penalty) by California, March 2018.
- Record on file since 1980, with 20 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 84 service lines.
Check whether Twin Valley Inc 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 10.5 mg/L, federal limit 10 mg/L (1.1 times the limit)
|
330 | Nov 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 10.6 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 |
|
Nitrate
Contaminant limit exceeded
Measured 10.5 mg/L, federal limit 10 mg/L (1.1 times the limit)
|
330 | Jun 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 10.6 mg/L, federal limit 10 mg/L (1.1 times the limit)
|
330 | Nov 1, 2022 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 10.7 mg/L, federal limit 10 mg/L (1.1 times the limit)
|
330 | Oct 1, 2022 |
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 | Sep 1, 2022 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 10.7 mg/L, federal limit 10 mg/L (1.1 times the limit)
|
330 | Aug 1, 2022 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 10.8 mg/L, federal limit 10 mg/L (1.1 times the limit)
|
330 | Jul 1, 2022 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 10.5 mg/L, federal limit 10 mg/L (1.1 times the limit)
|
330 | May 1, 2022 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 10.8 mg/L, federal limit 10 mg/L (1.1 times the limit)
|
330 | Dec 1, 2021 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.1 mg/L, federal limit 10 mg/L (1.1 times the limit)
|
330 | Nov 1, 2021 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 10.8 mg/L, federal limit 10 mg/L (1.1 times the limit)
|
330 | Oct 1, 2021 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.3 mg/L, federal limit 10 mg/L (1.1 times the limit)
|
330 | Sep 1, 2021 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.3 mg/L, federal limit 10 mg/L (1.1 times the limit)
|
330 | Aug 1, 2021 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.4 mg/L, federal limit 10 mg/L (1.1 times the limit)
|
330 | Jul 1, 2021 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.6 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Jun 1, 2021 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.5 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | May 1, 2021 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.6 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Apr 1, 2021 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.4 mg/L, federal limit 10 mg/L (1.1 times the limit)
|
330 | Mar 1, 2021 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.7 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Feb 1, 2021 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.9 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Jan 1, 2021 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 12.1 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Dec 1, 2020 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.8 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Nov 1, 2020 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.5 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Oct 1, 2020 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 12 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Aug 1, 2020 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.8 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Jul 1, 2020 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.7 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Jun 1, 2020 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.5 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | May 1, 2020 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 10.5 mg/L, federal limit 10 mg/L (1.1 times the limit)
|
330 | Apr 1, 2020 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.7 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Mar 1, 2020 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.6 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Feb 1, 2020 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 12 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Jan 1, 2020 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.5 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Dec 1, 2019 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.9 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Nov 1, 2019 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.8 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Oct 1, 2019 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.3 mg/L, federal limit 10 mg/L (1.1 times the limit)
|
330 | Sep 1, 2019 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.5 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Aug 1, 2019 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.9 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Jul 1, 2019 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.1 mg/L, federal limit 10 mg/L (1.1 times the limit)
|
330 | Jun 1, 2019 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.5 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | May 1, 2019 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 12 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Jan 1, 2019 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.3667 mg/L, federal limit 10 mg/L (1.1 times the limit)
|
330 | Dec 1, 2018 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 12.1 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Nov 1, 2018 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.8 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Oct 1, 2018 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.8 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Sep 1, 2018 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.6 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Aug 1, 2018 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.2 mg/L, federal limit 10 mg/L (1.1 times the limit)
|
330 | Jul 1, 2018 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.6 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Jun 1, 2018 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.4 mg/L, federal limit 10 mg/L (1.1 times the limit)
|
330 | May 1, 2018 |
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 | Apr 1, 2018 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 10.7 mg/L, federal limit 10 mg/L (1.1 times the limit)
|
330 | Mar 1, 2018 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 12.2 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Feb 1, 2018 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 12.1 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Jan 1, 2018 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
|
Nitrate
Contaminant limit exceeded
Measured 11.5 mg/L, federal limit 10 mg/L (1.2 times the limit)
|
330 | Dec 1, 2017 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
Yes |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Revised Total Coliform Rule
Monitoring violation
|
Feb 1, 2018 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Sep 1, 2017 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Revised Total Coliform Rule
Monitoring violation
|
Aug 1, 2017 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Revised Total Coliform Rule
Monitoring violation
|
Feb 1, 2017 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Nitrate
Monitoring and reporting
|
Jan 1, 2016 | Resolved |
Full record since 1980
EPA's records for Twin Valley Inc go back to 1980. Before October 19, 2016 they list 20 health-based violations (5 resolved, 15 archived by EPA without a recorded fix) and 28 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1980s | 15 | 11 |
| 1990s | 3 | 3 |
| 2000s | 0 | 3 |
| 2010 to October 18, 2016 | 2 | 11 |
| October 19, 2016 to 2019 | 22 | 4 |
| 2020s | 32 | 0 |
Most recent health-based violation before October 19, 2016: Total Coliform, began March 2015, Resolved.
Show all 20 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Coliform
Contaminant limit exceeded
|
Mar 1, 2015 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Nov 1, 2012 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Feb 1, 1996 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Aug 1, 1994 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Dec 1, 1993 | Resolved |
|
Nitrate (acute)
Contaminant limit exceeded
|
Apr 1, 1983 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Mar 1, 1983 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Jan 1, 1983 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Dec 1, 1982 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Nov 1, 1982 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Oct 6, 1982 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Oct 1, 1982 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Sep 8, 1982 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Aug 3, 1982 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
May 5, 1982 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Apr 6, 1982 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Mar 4, 1982 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Feb 3, 1982 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Dec 3, 1981 | Archived |
|
Nitrate (acute)
Contaminant limit exceeded
|
Nov 4, 1981 | Archived |
Enforcement actions
California regulators took 16 formal enforcement actions against Twin Valley Inc between 1993 and 2018. The most recent was a compliance order (no penalty) in March 2018.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Mar 9, 2018 | California | Compliance order (no penalty) | 1 violation: Revised Total Coliform Rule |
| Dec 19, 2017 | California | Compliance order (no penalty) | 54 violations (54 health-based): Nitrate |
| Oct 16, 2017 | California | Compliance order (no penalty) | 1 violation: Revised Total Coliform Rule |
| Sep 26, 2017 | California | Compliance order (no penalty) | 1 violation: Revised Total Coliform Rule |
| May 25, 2017 | California | Compliance order (no penalty) | 1 violation: Miscellaneous Other Rules |
| Apr 3, 2017 | California | Compliance order (no penalty) | 1 violation: Revised Total Coliform Rule |
| Feb 16, 2017 | California | Compliance order (no penalty) | 1 violation: Nitrate |
| Oct 10, 2016 | California | Compliance order (no penalty) | 1 violation: Miscellaneous Other Rules |
| Jun 15, 2016 | California | Compliance order with a penalty | 1 violation: Miscellaneous Other Rules |
| Apr 30, 2015 | California | Compliance order (no penalty) | 3 violations (1 health-based): Total Coliform, Groundwater Rule |
| Nov 18, 2014 | California | Compliance order (no penalty) | 1 violation: Groundwater Rule |
| Feb 11, 2013 | California | Compliance order (no penalty) | 4 violations: Asbestos, Chlorine, Total Trihalomethanes (TTHMs), Lead and Copper Rule |
| Dec 17, 2012 | California | Compliance order (no penalty) | 3 violations (1 health-based): Total Coliform, E. coli |
| Sep 13, 2012 | California | Compliance order (no penalty) | 1 violation: Total Coliform |
| Sep 1, 1998 | California | Signed compliance agreement | 1 violation (1 health-based): Nitrate |
| Aug 30, 1993 | California | Compliance order (no penalty) | 1 violation (1 health-based): Nitrate |
What the violations mean
Nitrate
54 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
Twin Valley Inc draws water from 5 wells (1 of them for emergency, seasonal or other part-time use).
Annual water quality report
Twin Valley Inc 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 Twin Valley Inc 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