Public water system record
City of Mattawa
Serves an area of Grant County, WA that includes Mattawa · 5,370 people served
Federal records show 1 health-based violation and 35 monitoring/reporting issues for City of Mattawa in the last ten years. The most serious issue in this window was a resolved Revised Total Coliform Rule violation.
System profile
- Health-based violations, last 10 years
- 1
- Resolved
- 1
- Unresolved
- 0
- Any acute record
- Yes
- Monitoring issues, last 10 years
- 35
Key facts
- City of Mattawa draws water from 4 wells (1 of them for emergency, seasonal or other part-time use).
- Most recent formal enforcement: signed compliance agreement by Washington, February 1997.
- Record on file since 1979, with 5 health-based violations before October 19, 2016.
- Lead pipe inventory: 0 lead and 0 unknown out of 64 service lines.
Check whether City of Mattawa 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 |
|---|---|---|---|---|
|
Revised Total Coliform Rule
Contaminant limit exceeded
|
110 | Jun 1, 2024 | Resolved | Yes |
Monitoring and reporting issues
Since October 2016Missed tests or reports, not contaminants found above a limit.
| Issue | Start date | Status |
|---|---|---|
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2023 | Resolved |
|
Consumer Confidence Rule
OTHER
|
Jul 1, 2016 | Resolved |
|
Styrene
Monitoring and reporting
|
Jan 1, 2014 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Ethylbenzene
Monitoring and reporting
|
Jan 1, 2014 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Toluene
Monitoring and reporting
|
Jan 1, 2014 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Benzene
Monitoring and reporting
|
Jan 1, 2014 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
CHLOROBENZENE
Monitoring and reporting
|
Jan 1, 2014 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Tetrachloroethylene
Monitoring and reporting
|
Jan 1, 2014 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
1,1,2-Trichloroethane
Monitoring and reporting
|
Jan 1, 2014 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Trichloroethylene
Monitoring and reporting
|
Jan 1, 2014 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
1,2-Dichloropropane
Monitoring and reporting
|
Jan 1, 2014 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Carbon tetrachloride
Monitoring and reporting
|
Jan 1, 2014 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
1,1,1-Trichloroethane
Monitoring and reporting
|
Jan 1, 2014 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
1,2-Dichloroethane
Monitoring and reporting
|
Jan 1, 2014 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
trans-1,2-Dichloroethylene
Monitoring and reporting
|
Jan 1, 2014 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
1,1-Dichloroethylene
Monitoring and reporting
|
Jan 1, 2014 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Vinyl chloride
Monitoring and reporting
|
Jan 1, 2014 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
p-Dichlorobenzene
Monitoring and reporting
|
Jan 1, 2014 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
o-Dichlorobenzene
Monitoring and reporting
|
Jan 1, 2014 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
DICHLOROMETHANE
Monitoring and reporting
|
Jan 1, 2014 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
cis-1,2-Dichloroethylene
Monitoring and reporting
|
Jan 1, 2014 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
1,2,4-Trichlorobenzene
Monitoring and reporting
|
Jan 1, 2014 |
Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
|
|
Thallium, Total
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
Beryllium, Total
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
Antimony, Total
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
Selenium
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
Nitrite
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
Nickel
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
Mercury
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
Fluoride
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
CYANIDE
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
Chromium (total)
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
Cadmium
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
Barium
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
|
Arsenic
Monitoring and reporting
|
Jan 1, 2014 | Resolved |
Full record since 1979
EPA's records for City of Mattawa go back to 1979. Before October 19, 2016 they list 5 health-based violations (5 archived by EPA without a recorded fix) and 170 monitoring or reporting violations.
| Violations that began in | Health-based | Monitoring and reporting |
|---|---|---|
| 1970s | 0 | 1 |
| 1990s | 5 | 11 |
| 2000s | 0 | 119 |
| 2010 to October 18, 2016 | 0 | 39 |
| 2020s | 1 | 1 |
Most recent health-based violation before October 19, 2016: Total Coliform, began June 1997, Archived.
Show all 5 health-based violations before October 19, 2016
| Contaminant | Start date | Status |
|---|---|---|
|
Total Coliform
Contaminant limit exceeded
|
Jun 1, 1997 | Archived |
|
Total Coliform
Contaminant limit exceeded
|
Oct 1, 1996 | Archived |
|
Total Coliform
Contaminant limit exceeded
|
Jun 1, 1995 | Archived |
|
Total Coliform
Contaminant limit exceeded
|
Feb 1, 1995 | Archived |
|
Total Coliform
Contaminant limit exceeded
|
May 1, 1994 | Archived |
Enforcement actions
Washington regulators took 2 formal enforcement actions against City of Mattawa between 1995 and 1997. The most recent was a signed compliance agreement in February 1997.
| Date | By | Action | Violations covered |
|---|---|---|---|
| Feb 28, 1997 | Washington | Signed compliance agreement | 4 violations (1 health-based): Total Coliform |
| Jul 7, 1995 | Washington | Signed compliance agreement | 6 violations (3 health-based): Total Coliform |
What the violations mean
Revised Total Coliform Rule
1 incidentThe system did not meet a requirement of the Revised Total Coliform Rule
Coliform and E. coli rules protect against bacteria in the distribution system
Where the water comes from
City of Mattawa draws water from 4 wells (1 of them for emergency, seasonal or other part-time use).
Annual water quality report
City of Mattawa 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 Washington.
Certified drinking water labs by state EPA guidance for private wells