Public Water Partners

Port Orchard, WA · Mason County

MASON COUNTY LOST LAKE Water System

Consumer Confidence Report status

MASON COUNTY LOST LAKE 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 MASON COUNTY LOST LAKE.

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 Washington’s official records. Always confirm current status with Washington before making decisions based on this information.

System facts

System ID (PWSID)
WA5348300
System type
Community Water System
Population served
96
Service connections
96
Ownership
privately owned
Water source
groundwater (wells)

MASON COUNTY LOST LAKE is one of 3,227 community water systems in Washington in the 500 or fewer people size category, serving 96 people from groundwater.

As of August 1, 2026, its federal record holds 16 entries in 2005, all of which EPA lists as closed. Nothing has been added since 2005.

All 16 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.

Violation history

  • Monitoring, Regular

    —

    Endrin

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    BHC-GAMMA

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Methoxychlor

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Toxaphene

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Di(2-ethylhexyl) adipate

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Simazine

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Di(2-ethylhexyl) phthalate

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Hexachlorocyclopentadiene

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Atrazine

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    LASSO

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Heptachlor

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Heptachlor epoxide

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    HEXACHLOROBENZENE

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Benzo(a)pyrene

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Pentachlorophenol

    January 1, 2005 – December 31, 2007

    Archived

  • Monitoring, Regular

    —

    Chlordane

    January 1, 2005 – December 31, 2007

    Resolved

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

Enforcement actions

No enforcement actions on record for this system.

Common questions

Is MASON COUNTY LOST LAKE required to publish a Consumer Confidence Report?

Yes. MASON COUNTY LOST LAKE 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 MASON COUNTY LOST LAKE’s next Consumer Confidence Report due?

MASON COUNTY LOST LAKE’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

Does MASON COUNTY LOST LAKE have any open drinking water violations on record?

As of August 1, 2026, EPA's federal records show no open violations for MASON COUNTY LOST LAKE.

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

MASON COUNTY LOST LAKE

Phone not on record

Port Orchard, WA 98366