Public water system record
Thunderbird CWD
Serves an area of San Bernardino County, CA · 2,098 people served
Federal records show 1 health-based violation and 2 monitoring/reporting issues for Thunderbird CWD 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
- Health-based violations, last 10 years
- 1
- Resolved
- 0
- Unresolved
- 0
- Archived by EPA
- 1
- Any acute record
- Yes
- Monitoring issues, last 10 years
- 2
Key facts
- Thunderbird CWD draws water from 2 wells.
- Highest measured level in the last 10 years: Nitrate, 11 mg/L, federal limit 10 mg/L (1.1 times the limit), 2025.
- Most recent formal enforcement: compliance order (no penalty) by California, August 2025.
- Record on file since 1980, with 8 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 93 unknown out of 328 service lines.
Check whether Thunderbird CWD 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 | Jan 1, 2025 |
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 |
|---|---|---|
|
Lead and Copper Rule
Monitoring and reporting
|
Jan 18, 2024 | Resolved |
|
Revised Total Coliform Rule
Monitoring violation
|
Feb 1, 2018 | Resolved |
Full record since 1980
EPA's records for Thunderbird CWD go back to 1980. Before October 19, 2016 they list 8 health-based violations (4 resolved, 4 archived by EPA without a recorded fix) and 6 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1980s | 4 | 5 |
| 1990s | 1 | 0 |
| 2000s | 3 | 1 |
| October 19, 2016 to 2019 | 0 | 1 |
| 2020s | 1 | 1 |
Most recent health-based violation before October 19, 2016: Total Coliform, began June 2009, Resolved.
Show all 8 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Coliform
Contaminant limit exceeded
|
Jun 1, 2009 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jun 1, 2004 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Apr 1, 2002 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Oct 1, 1996 | Resolved |
|
Fluoride
Contaminant limit exceeded
|
Oct 30, 1980 | Archived |
|
Fluoride
Contaminant limit exceeded
|
Jul 30, 1980 | Archived |
|
Fluoride
Contaminant limit exceeded
|
Jun 1, 1980 | Archived |
|
Fluoride
Contaminant limit exceeded
|
Mar 30, 1980 | Archived |
Enforcement actions
California regulators took 3 formal enforcement actions against Thunderbird CWD between 2009 and 2025. The most recent was a compliance order (no penalty) in August 2025.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Aug 28, 2025 | California | Compliance order (no penalty) | 1 violation (1 health-based): Nitrate |
| Jan 18, 2024 | California | Compliance order (no penalty) | 1 violation: Lead and Copper Rule |
| Aug 25, 2009 | California | Compliance order (no penalty) | 2 violations (1 health-based): Total Coliform |
What the violations mean
Nitrate
1 incidentNitrate 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
Thunderbird CWD draws water from 2 wells.
Annual water quality report
Thunderbird CWD 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