MT. SHASTA, CA · Siskiyou County
LAKE SISKIYOU M.W.C. Water System
Consumer Confidence Report status
LAKE SISKIYOU M.W.C. must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.
As of August 1, 2026, EPA's federal records show no open violations for LAKE SISKIYOU M.W.C..
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 California’s official records. Always confirm current status with California before making decisions based on this information.
System facts
- System ID (PWSID)
- CA4700549
- System type
- Community Water System
- Population served
- 277
- Service connections
- 84
- Ownership
- privately owned
- Water source
- groundwater (wells)
LAKE SISKIYOU M.W.C. is one of 3,951 community water systems in California in the 500 or fewer people size category, serving 277 people from groundwater.
As of August 1, 2026, its federal record holds 5 entries between 1980 and 2019, all of which EPA lists as closed. Nothing has been added since 2019.
Of the 5, 2 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 the Total Coliform Rules, the Radionuclides and Revised Rad Rule, and the Miscellaneous Other Rules.
Violation history
Treatment Technique, Level 1 Assessment (RTCR)
Health-basedRevised Total Coliform Rule
July 1, 2019 – July 31, 2019
ResolvedMaximum Contaminant Level Violation, Monthly (TCR)
Health-basedColiform (TCR)
July 1, 2007 – July 31, 2007
ResolvedNotification, Public
—No contaminant on record
July 1, 1984 – July 31, 1984
ArchivedMonitoring, Regular
—Gross Alpha, Excl. Radon and U
October 1, 1981 – September 30, 1982
ArchivedMonitoring, Regular
—Gross Alpha, Excl. Radon and U
October 30, 1980 – October 29, 1981
Archived
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 |
|---|---|---|---|---|
| July 1, 2019 – July 31, 2019 | Treatment Technique, Level 1 Assessment (RTCR) | Revised Total Coliform Rule | Health-based | Resolved |
| July 1, 2007 – July 31, 2007 | Maximum Contaminant Level Violation, Monthly (TCR) | Coliform (TCR) | Health-based | Resolved |
| July 1, 1984 – July 31, 1984 | Notification, Public | — | — | Archived |
| October 1, 1981 – September 30, 1982 | Monitoring, Regular | Gross Alpha, Excl. Radon and U | — | Archived |
| October 30, 1980 – October 29, 1981 | Monitoring, Regular | Gross Alpha, Excl. Radon and U | — | Archived |
Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)
Enforcement actions
- February 4, 2021State Formal Notice of Violation issued3 linked violations
Common questions
Is LAKE SISKIYOU M.W.C. required to publish a Consumer Confidence Report?
- Yes. LAKE SISKIYOU M.W.C. is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.
When is LAKE SISKIYOU M.W.C.’s next Consumer Confidence Report due?
- LAKE SISKIYOU M.W.C.’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does LAKE SISKIYOU M.W.C. have any open drinking water violations on record?
- As of August 1, 2026, EPA's federal records show no open violations for LAKE SISKIYOU M.W.C..
What is a Consumer Confidence Report?
- A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.
Contact
COHEN, TOM
530-926-5370
MT. SHASTA, CA 96067