Public water system record
Tonkawa
Serves an area of Kay County, OK that includes Tonkawa and Tonkawa Tribal Housing · 3,299 people served
Federal records show 1 health-based violation and 8 monitoring/reporting issues for Tonkawa in the last ten years. The most serious issue in this window was a resolved LEAD AND COPPER RULE REVISIONS violation.
System profile
- Health-based violations, last 10 years
- 1
- Resolved
- 1
- Unresolved
- 0
- Any acute record
- No
- Monitoring issues, last 10 years
- 8
Key facts
- Tonkawa draws water from 15 wells (1 of them for emergency, seasonal or other part-time use).
- Most recent formal enforcement: compliance order with a penalty by Oklahoma, September 2008.
- Record on file since 1995, with 5 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 1,255 unknown out of 1,255 service lines.
Check whether Tonkawa 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 |
|---|---|---|---|---|
|
LEAD AND COPPER RULE REVISIONS
Treatment technique failure
|
350 | Oct 17, 2024 | Resolved | No |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
E. coli
Monitoring and reporting
|
Aug 14, 2025 | Active |
|
LEAD AND COPPER RULE REVISIONS
RPT
|
Oct 17, 2024 | Resolved |
|
Haloacetic Acids (HAA5)
Monitoring and reporting
|
Oct 1, 2022 | Resolved |
|
Total Trihalomethanes (TTHMs)
Monitoring and reporting
|
Oct 1, 2022 | Resolved |
|
E. coli
Monitoring and reporting
|
Jan 19, 2017 | Active |
|
E. coli
Monitoring and reporting
|
Sep 17, 2015 | Active |
|
E. coli
Monitoring and reporting
|
Sep 18, 2014 | Active |
|
E. coli
Monitoring and reporting
|
Aug 21, 2014 | Active |
Full record since 1995
EPA's records for Tonkawa go back to 1995. Before October 19, 2016 they list 5 health-based violations (5 resolved) and 28 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1990s | 1 | 2 |
| 2000s | 3 | 19 |
| 2010 to October 18, 2016 | 1 | 7 |
| October 19, 2016 to 2019 | 0 | 1 |
| 2020s | 1 | 4 |
Most recent health-based violation before October 19, 2016: Total Coliform, began October 2011, Resolved.
Show all 5 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Coliform
Contaminant limit exceeded
|
Oct 1, 2011 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 2008 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Mar 1, 2007 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Jan 1, 2004 | Resolved |
|
Total Coliform
Contaminant limit exceeded
|
Sep 1, 1998 | Resolved |
Enforcement actions
Oklahoma regulators took 3 formal enforcement actions against Tonkawa between 2001 and 2008, filed as 4 records in EPA's data. The most recent was a compliance order with a penalty in September 2008.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Sep 16, 2008 | Oklahoma | Compliance order with a penalty | 7 violations: Picloram, LASSO, BHC-GAMMA, Atrazine, Glyphosate |
| Feb 6, 2002 | Oklahoma | Compliance order with a penalty | 2 violations: Nitrate, Nitrite |
| Nov 5, 2001 | Oklahoma | Compliance order with a penalty | 6 violations: Gross Alpha, Excl. Radon and U, Gross Beta Particle Activity, Combined Radium (-226 and -228) |
What the violations mean
LEAD AND COPPER RULE REVISIONS
1 incidentThe system did not complete a treatment step or action that the LEAD AND COPPER RULE REVISIONS requires (a treatment technique violation).
The utility had to notify customers about this violation.
Where the water comes from
Tonkawa draws water from 15 wells (1 of them for emergency, seasonal or other part-time use). 1 other community water system buys water from Tonkawa.
Community systems that buy water from it
- Tonkawa Tribe of Oklahoma Tonkawa, OK
Annual water quality report
Tonkawa 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 Oklahoma.
Certified drinking water labs by state EPA guidance for private wells