Ft. Defiance, NN

Bass Lake OM Water System

Inactive system

This water system is marked inactive in EPA’s federal records as of October 31, 2006. It is no longer an operating public water system under this PWSID, and no compliance deadlines — including the 2027 Consumer Confidence Report rule — apply to it.

If you are a resident looking for your current water provider, see water systems in NN.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace Navajo Nation’s official records. Always confirm current status with Navajo Nation before making decisions based on this information.

System facts

System ID (PWSID): NN3500294
System type: Community Water System
Population served: 100
Service connections: 21
Ownership: Native American tribal
Water source: groundwater (wells)

Bass Lake OM is one of 125 community water systems in Navajo Nation in the 500 or fewer people size category, formerly serving 100 people from groundwater.

EPA's federal records list this system as inactive in 2006; the record below is historical.

As of August 1, 2026, its federal record holds 61 entries between 2001 and 2004, all of which EPA lists as closed. Nothing has been added since 2004.

All 61 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves synthetic organic chemicals, volatile organic chemicals, and the Total Coliform Rules.

Violation history

Monitoring, Routine Major (TCR)
—
Coliform (TCR)
August 1, 2004 – August 31, 2004
Resolved
Monitoring, Regular
—
Endrin
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
BHC-GAMMA
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Methoxychlor
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Toxaphene
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Dalapon
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Diquat
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Endothall
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Glyphosate
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) adipate
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
OXAMYL
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Simazine
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) phthalate
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Picloram
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Dinoseb
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Hexachlorocyclopentadiene
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Aldicarb sulfoxide
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Aldicarb sulfone
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Carbofuran
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Aldicarb
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Atrazine
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
LASSO
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
2,3,7,8-TCDD
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Heptachlor
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
Heptachlor epoxide
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
2,4-D
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
2,4,5-TP
January 1, 2004 – December 31, 2004
Resolved
Monitoring, Regular
—
HEXACHLOROBENZENE
January 1, 2004 – December 31, 2004
Archived
Monitoring, Regular
—
Benzo(a)pyrene
January 1, 2004 – December 31, 2004
Archived
Monitoring, Regular
—
Pentachlorophenol
January 1, 2004 – December 31, 2004
Archived
Monitoring, Regular
—
1,2,4-Trichlorobenzene
January 1, 2004 – December 31, 2004
Archived
Monitoring, Regular
—
cis-1,2-Dichloroethylene
January 1, 2004 – December 31, 2004
Archived
Monitoring, Regular
—
Total Polychlorinated Biphenyls (PCB)
January 1, 2004 – December 31, 2004
Archived
Monitoring, Regular
—
1,2-DIBROMO-3-CHLOROPROPANE
January 1, 2004 – December 31, 2004
Archived
Monitoring, Regular
—
ETHYLENE DIBROMIDE
January 1, 2004 – December 31, 2004
Archived
Monitoring, Regular
—
Xylenes, Total
January 1, 2004 – December 31, 2004
Archived
Monitoring, Regular
—
Chlordane
January 1, 2004 – December 31, 2004
Archived
Monitoring, Regular
—
DICHLOROMETHANE
January 1, 2004 – December 31, 2004
Archived
Monitoring, Regular
—
o-Dichlorobenzene
January 1, 2004 – December 31, 2004
Archived
Monitoring, Regular
—
p-Dichlorobenzene
January 1, 2004 – December 31, 2004
Archived
Monitoring, Regular
—
Vinyl chloride
January 1, 2004 – December 31, 2004
Archived
Monitoring, Regular
—
1,1-Dichloroethylene
January 1, 2004 – December 31, 2004
Archived
Monitoring, Regular
—
trans-1,2-Dichloroethylene
January 1, 2004 – December 31, 2004
Archived
Monitoring, Regular
—
1,2-Dichloroethane
January 1, 2004 – December 31, 2004
Archived
Monitoring, Regular
—
1,1,1-Trichloroethane
January 1, 2004 – December 31, 2004
Archived
Monitoring, Regular
—
Carbon tetrachloride
January 1, 2004 – December 31, 2004
Archived
Monitoring, Regular
—
Tetrachloroethylene
January 1, 2004 – December 31, 2004
Archived
Monitoring, Regular
—
CHLOROBENZENE
January 1, 2004 – December 31, 2004
Archived
Monitoring, Regular
—
Benzene
January 1, 2004 – December 31, 2004
Archived
Monitoring, Regular
—
Toluene
January 1, 2004 – December 31, 2004
Archived
Monitoring, Regular
—
Ethylbenzene
January 1, 2004 – December 31, 2004
Archived
Monitoring, Regular
—
Styrene
January 1, 2004 – December 31, 2004
Archived
Monitoring, Regular
—
1,2-Dichloropropane
January 1, 2004 – December 31, 2004
Archived
Monitoring, Regular
—
Trichloroethylene
January 1, 2004 – December 31, 2004
Archived
Monitoring, Regular
—
1,1,2-Trichloroethane
January 1, 2004 – December 31, 2004
Archived
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
June 1, 2002 – June 30, 2002
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
May 1, 2002 – May 31, 2002
Archived
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
May 1, 2002 – May 31, 2002
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
April 1, 2002 – April 30, 2002
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
October 1, 2001 – October 31, 2001
Archived
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
October 1, 2001 – October 31, 2001
Resolved

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Period	Violation	Contaminant / rule	Health-based	Status
August 1, 2004 – August 31, 2004	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Endrin	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	BHC-GAMMA	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Methoxychlor	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Toxaphene	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Dalapon	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Diquat	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Endothall	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Glyphosate	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Di(2-ethylhexyl) adipate	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	OXAMYL	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Simazine	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Di(2-ethylhexyl) phthalate	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Picloram	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Dinoseb	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Hexachlorocyclopentadiene	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Aldicarb sulfoxide	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Aldicarb sulfone	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Carbofuran	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Aldicarb	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Atrazine	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	LASSO	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	2,3,7,8-TCDD	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Heptachlor	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	Heptachlor epoxide	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	2,4-D	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	2,4,5-TP	—	Resolved
January 1, 2004 – December 31, 2004	Monitoring, Regular	HEXACHLOROBENZENE	—	Archived
January 1, 2004 – December 31, 2004	Monitoring, Regular	Benzo(a)pyrene	—	Archived
January 1, 2004 – December 31, 2004	Monitoring, Regular	Pentachlorophenol	—	Archived
January 1, 2004 – December 31, 2004	Monitoring, Regular	1,2,4-Trichlorobenzene	—	Archived
January 1, 2004 – December 31, 2004	Monitoring, Regular	cis-1,2-Dichloroethylene	—	Archived
January 1, 2004 – December 31, 2004	Monitoring, Regular	Total Polychlorinated Biphenyls (PCB)	—	Archived
January 1, 2004 – December 31, 2004	Monitoring, Regular	1,2-DIBROMO-3-CHLOROPROPANE	—	Archived
January 1, 2004 – December 31, 2004	Monitoring, Regular	ETHYLENE DIBROMIDE	—	Archived
January 1, 2004 – December 31, 2004	Monitoring, Regular	Xylenes, Total	—	Archived
January 1, 2004 – December 31, 2004	Monitoring, Regular	Chlordane	—	Archived
January 1, 2004 – December 31, 2004	Monitoring, Regular	DICHLOROMETHANE	—	Archived
January 1, 2004 – December 31, 2004	Monitoring, Regular	o-Dichlorobenzene	—	Archived
January 1, 2004 – December 31, 2004	Monitoring, Regular	p-Dichlorobenzene	—	Archived
January 1, 2004 – December 31, 2004	Monitoring, Regular	Vinyl chloride	—	Archived
January 1, 2004 – December 31, 2004	Monitoring, Regular	1,1-Dichloroethylene	—	Archived
January 1, 2004 – December 31, 2004	Monitoring, Regular	trans-1,2-Dichloroethylene	—	Archived
January 1, 2004 – December 31, 2004	Monitoring, Regular	1,2-Dichloroethane	—	Archived
January 1, 2004 – December 31, 2004	Monitoring, Regular	1,1,1-Trichloroethane	—	Archived
January 1, 2004 – December 31, 2004	Monitoring, Regular	Carbon tetrachloride	—	Archived
January 1, 2004 – December 31, 2004	Monitoring, Regular	Tetrachloroethylene	—	Archived
January 1, 2004 – December 31, 2004	Monitoring, Regular	CHLOROBENZENE	—	Archived
January 1, 2004 – December 31, 2004	Monitoring, Regular	Benzene	—	Archived
January 1, 2004 – December 31, 2004	Monitoring, Regular	Toluene	—	Archived
January 1, 2004 – December 31, 2004	Monitoring, Regular	Ethylbenzene	—	Archived
January 1, 2004 – December 31, 2004	Monitoring, Regular	Styrene	—	Archived
January 1, 2004 – December 31, 2004	Monitoring, Regular	1,2-Dichloropropane	—	Archived
January 1, 2004 – December 31, 2004	Monitoring, Regular	Trichloroethylene	—	Archived
January 1, 2004 – December 31, 2004	Monitoring, Regular	1,1,2-Trichloroethane	—	Archived
June 1, 2002 – June 30, 2002	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
May 1, 2002 – May 31, 2002	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Archived
May 1, 2002 – May 31, 2002	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
April 1, 2002 – April 30, 2002	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
October 1, 2001 – October 31, 2001	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Archived
October 1, 2001 – October 31, 2001	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

August 8, 2007State Compliance achieved5 linked violations
March 19, 2007State Compliance achieved26 linked violations
June 21, 2005State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record

Last known contact on file (system is inactive)

Navajo Department of Water Resources

9287294033

Ft. Defiance, AZ 86504-0678