Grindstone Rancheria

Compiled by PlainEnviro · August 25, 2026

PWSID: 090605004 · Elk Creek, CA · Serves 150 people

According to EPA Safe Drinking Water Information System (SDWIS), Grindstone Rancheria (PWSID 090605004) in Elk Creek, CA is listed as a CWS water system covering about 150 people. The same extract lists 234 health-based violation records spanning 2014-2024. Those 234 health-based rows for Grindstone Rancheria cover contaminants such as Surface Water Treatment Rule, Revised Total Coliform Rule, Stage 1 Disinfectants and Disinfection Byproducts Rule; they remain historical EPA registry entries, not a current compliance or drinkability score.

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Health-Based Records

Grindstone Rancheria has 234 health-based violation records in this historical extract. Monitoring and reporting records are not included.

Population Served

150

Health-Based Violation Records

234

Distinct Contaminant Codes

Source Type

Surface Water

PlainEnviro's health-based SDWIS extract covers monitoring and reporting violations only -- it does not include unresolved enforcement actions in progress or corrective steps a utility has taken since the extract date. 3 distinct EPA contaminant codes appear in this system's record, including Surface Water Treatment Rule, Revised Total Coliform Rule, Stage 1 Disinfectants and Disinfection Byproducts Rule. Recorded violations span 2014–2024. Day-to-day primacy enforcement for this system runs through the California drinking-water program, not EPA directly.

A historical health-based record does not necessarily describe current water quality or compliance. The most authoritative current source is the utility's annual Consumer Confidence Report. For enforcement history and corrective-action orders, consult EPA ECHO and the California state drinking-water program's public portal.

System Details

EPA ID (PWSID): 090605004
System Type: CWS
Water Source: Surface Water
Location: Elk Creek, CA
Population Served: 150
Health Violations: Yes (234)

What contaminants are in this water system?

Contaminant	Violations	Health-Based
Surface Water Treatment Rule	196	196
Revised Total Coliform Rule	35	35
Stage 1 Disinfectants and Disinfection Byproducts Rule	3	3

Violation History (234)

Contaminant	Type	Health	Date	Enforcement
Surface Water Treatment Rule	TT	Yes	Mar 1, 2024	0605004FL12151711727
Surface Water Treatment Rule	TT	Yes	Mar 1, 2024	0605004FL12151711727
Surface Water Treatment Rule	TT	Yes	Sep 1, 2023	0605004FL12151711546
Surface Water Treatment Rule	TT	Yes	Sep 1, 2023	0605004FL12151711546
Surface Water Treatment Rule	TT	Yes	Sep 1, 2023	0605004FL12151711546
Surface Water Treatment Rule	TT	Yes	Aug 1, 2023	0605004FL12151711546
Surface Water Treatment Rule	TT	Yes	Aug 1, 2023	0605004FL12151711546
Surface Water Treatment Rule	TT	Yes	Aug 1, 2023	0605004FL12151711546
Surface Water Treatment Rule	TT	Yes	Apr 1, 2023	0605004FL12151711513
Surface Water Treatment Rule	TT	Yes	Apr 1, 2023	0605004FL12151711513
Surface Water Treatment Rule	TT	Yes	Apr 1, 2023	0605004FL12151711513
Surface Water Treatment Rule	TT	Yes	Mar 1, 2023	-
Surface Water Treatment Rule	TT	Yes	Mar 1, 2023	0605004OX05082311496
Surface Water Treatment Rule	TT	Yes	Mar 1, 2023	0605004OX05082311496
Surface Water Treatment Rule	TT	Yes	Mar 1, 2023	0605004OX05082311496
Surface Water Treatment Rule	TT	Yes	Feb 1, 2023	-
Surface Water Treatment Rule	TT	Yes	Feb 1, 2023	0605004OX05082311496
Surface Water Treatment Rule	TT	Yes	Feb 1, 2023	0605004OX05082311496
Surface Water Treatment Rule	TT	Yes	Feb 1, 2023	0605004OX05082311496
Surface Water Treatment Rule	TT	Yes	Jan 1, 2023	-
Surface Water Treatment Rule	TT	Yes	Jan 1, 2023	0605004OX05082311496
Surface Water Treatment Rule	TT	Yes	Jan 1, 2023	0605004OX05082311496
Surface Water Treatment Rule	TT	Yes	Jan 1, 2023	0605004OX05082311496
Surface Water Treatment Rule	TT	Yes	Dec 1, 2022	-
Surface Water Treatment Rule	TT	Yes	Dec 1, 2022	0605004OX05082311495
Surface Water Treatment Rule	TT	Yes	Dec 1, 2022	0605004OX05082311495
Surface Water Treatment Rule	TT	Yes	Nov 1, 2022	-
Surface Water Treatment Rule	TT	Yes	Nov 1, 2022	0605004OX05082311495
Surface Water Treatment Rule	TT	Yes	Nov 1, 2022	0605004OX05082311495
Surface Water Treatment Rule	TT	Yes	Oct 1, 2022	-
Surface Water Treatment Rule	TT	Yes	Oct 1, 2022	0605004OX05082311495
Surface Water Treatment Rule	TT	Yes	Oct 1, 2022	0605004OX05082311495
Revised Total Coliform Rule	TT	Yes	Apr 1, 2022	-
Revised Total Coliform Rule	TT	Yes	Mar 1, 2022	-
Surface Water Treatment Rule	TT	Yes	Mar 1, 2022	0605004FL12151711310
Surface Water Treatment Rule	TT	Yes	Mar 1, 2022	0605004FL12151711310
Revised Total Coliform Rule	TT	Yes	Feb 1, 2022	0605004FL12151711310
Revised Total Coliform Rule	TT	Yes	Feb 1, 2022	-
Surface Water Treatment Rule	TT	Yes	Feb 1, 2022	0605004FL12151711310
Surface Water Treatment Rule	TT	Yes	Feb 1, 2022	0605004FL12151711310
Stage 1 Disinfectants and Disinfection Byproducts Rule	TT	Yes	Jan 1, 2022	0605004FL12151711309
Revised Total Coliform Rule	MCL	Yes	Jan 1, 2022	0605004FL12151711309
Revised Total Coliform Rule	MCL	Yes	Jan 1, 2022	0605004FL12151711309
Revised Total Coliform Rule	MCL	Yes	Jan 1, 2022	0605004OX05022512129
Surface Water Treatment Rule	TT	Yes	Jan 1, 2022	0605004FL12151711310
Surface Water Treatment Rule	TT	Yes	Jan 1, 2022	0605004FL12151711310
Revised Total Coliform Rule	MCL	Yes	Dec 1, 2021	0605004FL12151710934
Revised Total Coliform Rule	MCL	Yes	Dec 1, 2021	0605004FL12151710934
Revised Total Coliform Rule	MCL	Yes	Dec 1, 2021	0605004OX05022512129
Revised Total Coliform Rule	TT	Yes	Dec 1, 2021	-
Surface Water Treatment Rule	TT	Yes	Dec 1, 2021	0605004FL12151710934
Surface Water Treatment Rule	TT	Yes	Dec 1, 2021	0605004FL12151710934
Revised Total Coliform Rule	MCL	Yes	Nov 1, 2021	0605004FL12151710934
Revised Total Coliform Rule	MCL	Yes	Nov 1, 2021	0605004FL12151710934
Revised Total Coliform Rule	MCL	Yes	Nov 1, 2021	0605004OX05022512129
Surface Water Treatment Rule	TT	Yes	Nov 1, 2021	0605004FL12151710934
Surface Water Treatment Rule	TT	Yes	Nov 1, 2021	0605004FL12151710934
Revised Total Coliform Rule	MCL	Yes	Oct 1, 2021	0605004FL12151710933
Revised Total Coliform Rule	MCL	Yes	Oct 1, 2021	0605004FL12151710933
Revised Total Coliform Rule	MCL	Yes	Oct 1, 2021	0605004OX05022512129
Surface Water Treatment Rule	TT	Yes	Oct 1, 2021	0605004FL12151710934
Surface Water Treatment Rule	TT	Yes	Oct 1, 2021	0605004FL12151710934
Revised Total Coliform Rule	MCL	Yes	Sep 1, 2021	0605004FL12151710932
Revised Total Coliform Rule	MCL	Yes	Sep 1, 2021	0605004FL12151710932
Revised Total Coliform Rule	MCL	Yes	Sep 1, 2021	0605004OX05022512129
Revised Total Coliform Rule	TT	Yes	Sep 1, 2021	0605004FL12151710932
Surface Water Treatment Rule	TT	Yes	Sep 1, 2021	0605004FL12151710933
Surface Water Treatment Rule	TT	Yes	Sep 1, 2021	0605004FL12151710933
Surface Water Treatment Rule	TT	Yes	Aug 1, 2021	0605004FL12151710933
Surface Water Treatment Rule	TT	Yes	Aug 1, 2021	0605004FL12151710933
Surface Water Treatment Rule	TT	Yes	Jul 1, 2021	0605004FL12151710933
Surface Water Treatment Rule	TT	Yes	Jul 1, 2021	0605004FL12151710933
Revised Total Coliform Rule	MCL	Yes	Apr 1, 2021	0605004FL12151710619
Revised Total Coliform Rule	MCL	Yes	Apr 1, 2021	0605004FL12151710619
Revised Total Coliform Rule	MCL	Yes	Apr 1, 2021	0605004OX05022512129
Revised Total Coliform Rule	TT	Yes	Apr 1, 2021	0605004FL12151710619
Surface Water Treatment Rule	TT	Yes	Apr 1, 2021	0605004OX05172110619
Surface Water Treatment Rule	TT	Yes	Apr 1, 2021	0605004OX05172110619
Revised Total Coliform Rule	TT	Yes	Mar 1, 2021	0605004FL12151710932
Revised Total Coliform Rule	TT	Yes	Mar 1, 2021	0605004FL12151710932
Surface Water Treatment Rule	TT	Yes	Mar 1, 2021	0605004OX05062110586
Surface Water Treatment Rule	TT	Yes	Mar 1, 2021	0605004OX05062110586
Surface Water Treatment Rule	TT	Yes	Mar 1, 2021	0605004OX05062110586
Surface Water Treatment Rule	TT	Yes	Mar 1, 2021	0605004OX05062110586
Revised Total Coliform Rule	MCL	Yes	Feb 1, 2021	0605004OX06082110601
Revised Total Coliform Rule	MCL	Yes	Feb 1, 2021	0605004OX06082110601
Revised Total Coliform Rule	TT	Yes	Feb 1, 2021	-
Surface Water Treatment Rule	TT	Yes	Feb 1, 2021	0605004OX05062110586
Surface Water Treatment Rule	TT	Yes	Feb 1, 2021	0605004OX05062110586
Surface Water Treatment Rule	TT	Yes	Feb 1, 2021	0605004OX05062110586
Surface Water Treatment Rule	TT	Yes	Feb 1, 2021	0605004OX05062110586
Revised Total Coliform Rule	MCL	Yes	Jan 1, 2021	0605004OX06082110601
Revised Total Coliform Rule	MCL	Yes	Jan 1, 2021	0605004OX06082110601
Revised Total Coliform Rule	TT	Yes	Nov 1, 2020	0605004OX02092110602
Revised Total Coliform Rule	TT	Yes	Nov 1, 2020	0605004OX02092110602
Surface Water Treatment Rule	TT	Yes	Nov 1, 2020	0605004OX05062110586
Surface Water Treatment Rule	TT	Yes	Nov 1, 2020	0605004OX05062110586
Surface Water Treatment Rule	TT	Yes	Oct 1, 2020	0605004OX05062110586
Surface Water Treatment Rule	TT	Yes	Oct 1, 2020	0605004OX05062110586
Revised Total Coliform Rule	TT	Yes	Sep 1, 2020	0605004FL12151710454

Showing 100 of 234 violations.

Frequently Asked Questions

What does EPA SDWIS list for Grindstone Rancheria?

Grindstone Rancheria has 234 health-based violation records in this historical extract. Monitoring and reporting records are not included. The system uses surface water water as its source.

How many people does Grindstone Rancheria serve?

Grindstone Rancheria serves 150 people in Elk Creek, CA. It is classified as a CWS water system.

What violations does Grindstone Rancheria have?

Grindstone Rancheria has 234 health-based violation records in PlainEnviro's extract spanning 2014–2024. Monitoring and reporting records are not included.

What contaminants have been found in Grindstone Rancheria water?

Violations have been recorded for 3 contaminants. The most frequent: Surface Water Treatment Rule, Revised Total Coliform Rule, Stage 1 Disinfectants and Disinfection Byproducts Rule.

Compare beyond California

Nationwide peers by violations & population served

Cross-state SDWIS systems nearest Grindstone Rancheria on cumulative violation count (234) and EPA-reported population served (150). Violation-count peers include CITY OF SEMINOLE, EUFAULA PWA, PUSHMATAHA CO. RWD #3.

Similar violation count

Nearest cross-state community systems (500+ served) by SDWIS violations on record.

Nearby Water Systems

CITY OF ORLAND

Orland · 8,298 served

Clean

ARTOIS COMMUNITY S.D.

Artois · 254 served

Clean

ELK CREEK COMMUNITY S.D.

Elk Creek · 212 served

4 viol.

BUTTE CITY COMMUNITY S.D.

Butte City · 75 served

1 viol.

Explore More

California Water Systems → All States → Contaminants →

About This Data

Grindstone Rancheria (090605004) is drawn from EPA SDWIS. Nearby county systems in this extract include CITY OF ORLAND; ARTOIS COMMUNITY S.D.; ELK CREEK COMMUNITY S.D.; BUTTE CITY COMMUNITY S.D.. Health-based rows (234 MCL/TT) are historical registry state, not a current drinkability score.

Source: U.S. Environmental Protection Agency, SDWIS Federal Reporting Services

Read our methodology - how this data is sourced, computed, and verified.

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