Willits, 09

Mitomkai Tribal Water System Water System

Current status

1 item on record is open and awaiting resolution as of July 4, 2026. None are health-based violations — open items of this kind are most often monitoring or reporting requirements, not water-safety findings. Full details are in the violation history below.

This system's next federally required Consumer Confidence Report is due July 1, 2027, under the EPA's revised reporting rule.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 2026. This is a record-keeping and public-information tool — it does not replace EPA Region 9’s official records. Always confirm current status with EPA Region 9 before making decisions based on this information.

System facts

System ID (PWSID): 090605120
System type: Community Water System
Population served: 300
Service connections: 21
Ownership: Native American tribal
Water source: groundwater (wells)

Violation history

Monitoring, Source Water (GWR)
—
E. COLI
September 1, 2025
Unaddressed
Report Sample Result/Fail Monitor (RTCR)
—
Revised Total Coliform Rule
August 1, 2025 – September 25, 2025
Resolved
Monitoring and Reporting (DBP)
—
Chlorine
October 1, 2024 – December 31, 2024
Resolved
Monitoring and Reporting (DBP)
—
Chlorine
October 1, 2023 – December 31, 2023
Resolved
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
December 1, 2022 – December 31, 2022
Resolved
Monitoring and Reporting (DBP)
—
Chlorine
October 1, 2022 – December 31, 2022
Resolved
Monitoring, Regular
—
Nitrate
January 1, 2022 – December 31, 2022
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
January 1, 2015 – March 31, 2015
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
October 1, 2014 – December 31, 2014
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
September 1, 2014 – September 30, 2014
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
July 1, 2014 – September 30, 2014
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
March 1, 2014 – March 31, 2014
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
January 1, 2014 – March 31, 2014
Resolved
Monitoring, Regular
—
Combined Radium (-226 and -228)
January 1, 2014 – March 31, 2014
Resolved
Follow-up Or Routine LCR Tap M/R
—
Lead and Copper Rule
January 1, 2014 – December 8, 2014
Resolved
Monitoring, Regular
—
Hexachlorocyclopentadiene
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
Carbofuran
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
Atrazine
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
Heptachlor
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
Heptachlor epoxide
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
2,4,5-TP
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
HEXACHLOROBENZENE
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
Benzo(a)pyrene
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
Pentachlorophenol
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
Total Polychlorinated Biphenyls (PCB)
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
Nitrate
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
Trichloroethylene
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
Combined Radium (-226 and -228)
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
Chlordane
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
Endrin
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
BHC-GAMMA
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
Methoxychlor
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
Toxaphene
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
Dalapon
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
Diquat
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
Endothall
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
Glyphosate
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) adipate
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
OXAMYL
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
Simazine
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) phthalate
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
Picloram
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
Dinoseb
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
LASSO
October 1, 2013 – December 31, 2013
Resolved
Monitoring, Regular
—
trans-1,2-Dichloroethylene
July 1, 2013 – September 30, 2013
Resolved
Monitoring, Regular
—
ETHYLENE DIBROMIDE
July 1, 2013 – September 30, 2013
Resolved
Monitoring, Regular
—
1,2-DIBROMO-3-CHLOROPROPANE
July 1, 2013 – September 30, 2013
Resolved
Monitoring, Regular
—
1,2,4-Trichlorobenzene
July 1, 2013 – September 30, 2013
Resolved
Monitoring, Regular
—
Glyphosate
July 1, 2013 – September 30, 2013
Resolved
Monitoring, Regular
—
Nitrite
July 1, 2013 – September 30, 2013
Resolved
Monitoring, Regular
—
Nitrate
July 1, 2013 – September 30, 2013
Resolved
Monitoring, Regular
—
1,1,2-Trichloroethane
July 1, 2013 – September 30, 2013
Resolved

Unaddressed no corrective action on record yetResolved addressed and confirmed by the state

Period	Violation	Contaminant / rule	Health-based	Status
September 1, 2025	Monitoring, Source Water (GWR)	E. COLI	—	Unaddressed
August 1, 2025 – September 25, 2025	Report Sample Result/Fail Monitor (RTCR)	Revised Total Coliform Rule	—	Resolved
October 1, 2024 – December 31, 2024	Monitoring and Reporting (DBP)	Chlorine	—	Resolved
October 1, 2023 – December 31, 2023	Monitoring and Reporting (DBP)	Chlorine	—	Resolved
December 1, 2022 – December 31, 2022	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
October 1, 2022 – December 31, 2022	Monitoring and Reporting (DBP)	Chlorine	—	Resolved
January 1, 2022 – December 31, 2022	Monitoring, Regular	Nitrate	—	Resolved
January 1, 2015 – March 31, 2015	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Resolved
October 1, 2014 – December 31, 2014	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Resolved
September 1, 2014 – September 30, 2014	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
July 1, 2014 – September 30, 2014	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Resolved
March 1, 2014 – March 31, 2014	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
January 1, 2014 – March 31, 2014	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Resolved
January 1, 2014 – March 31, 2014	Monitoring, Regular	Combined Radium (-226 and -228)	—	Resolved
January 1, 2014 – December 8, 2014	Follow-up Or Routine LCR Tap M/R	Lead and Copper Rule	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	Hexachlorocyclopentadiene	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	Carbofuran	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	Atrazine	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	Heptachlor	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	Heptachlor epoxide	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	2,4,5-TP	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	HEXACHLOROBENZENE	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	Benzo(a)pyrene	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	Pentachlorophenol	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	Total Polychlorinated Biphenyls (PCB)	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	Nitrate	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	Trichloroethylene	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	Combined Radium (-226 and -228)	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	Chlordane	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	Endrin	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	BHC-GAMMA	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	Methoxychlor	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	Toxaphene	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	Dalapon	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	Diquat	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	Endothall	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	Glyphosate	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	Di(2-ethylhexyl) adipate	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	OXAMYL	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	Simazine	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	Di(2-ethylhexyl) phthalate	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	Picloram	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	Dinoseb	—	Resolved
October 1, 2013 – December 31, 2013	Monitoring, Regular	LASSO	—	Resolved
July 1, 2013 – September 30, 2013	Monitoring, Regular	trans-1,2-Dichloroethylene	—	Resolved
July 1, 2013 – September 30, 2013	Monitoring, Regular	ETHYLENE DIBROMIDE	—	Resolved
July 1, 2013 – September 30, 2013	Monitoring, Regular	1,2-DIBROMO-3-CHLOROPROPANE	—	Resolved
July 1, 2013 – September 30, 2013	Monitoring, Regular	1,2,4-Trichlorobenzene	—	Resolved
July 1, 2013 – September 30, 2013	Monitoring, Regular	Glyphosate	—	Resolved
July 1, 2013 – September 30, 2013	Monitoring, Regular	Nitrite	—	Resolved
July 1, 2013 – September 30, 2013	Monitoring, Regular	Nitrate	—	Resolved
July 1, 2013 – September 30, 2013	Monitoring, Regular	1,1,2-Trichloroethane	—	Resolved

Unaddressed no corrective action on record yetResolved addressed and confirmed by the state

Enforcement actions

December 2, 2025Federal Violation/Reminder Notice1 linked violation
September 25, 2025Federal Compliance achieved1 linked violation
April 3, 2025Federal Violation/Reminder Notice1 linked violation
April 1, 2025Federal Violation/Reminder Notice1 linked violation
January 9, 2025Federal Compliance achieved1 linked violation
January 29, 2024Federal Compliance achieved1 linked violation
August 11, 2023Federal Compliance achieved1 linked violation
February 9, 2023Federal Compliance achieved2 linked violations
July 30, 2015Federal Compliance achieved1 linked violation
July 30, 2015Federal Compliance achieved1 linked violation
July 30, 2015Federal Compliance achieved1 linked violation
December 22, 2014Federal Compliance achieved1 linked violation
December 22, 2014Federal Compliance achieved1 linked violation
December 8, 2014Federal Compliance achieved1 linked violation
November 25, 2014Federal Compliance achieved1 linked violation
November 25, 2014Federal Compliance achieved1 linked violation
November 13, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation
August 25, 2014Federal Compliance achieved1 linked violation

Contact

Sherwood Valley Rancheria

7074599690

Willits, CA 95490