Lancaster Water Quality
California
According to EPA SDWIS, Lancaster, California is served by 19 community water systems covering about 8,296 people. The same extract lists 289 health-based violation records, most recently coded 1005 in 2025. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in Lancaster, California is delivered through 19 EPA-regulated community water systems serving an estimated 8,296 people. Each system is tracked in the EPA Safe Drinking Water Information System (SDWIS) under the Safe Drinking Water Act, which requires testing for regulated contaminants, consumer notification of violations, and publication of an annual Consumer Confidence Report.
PlainEnviro's health-based SDWIS extract shows 289 violation records across the 19 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 5 distinct EPA contaminant codes: Arsenic, LEAD AND COPPER RULE REVISIONS, Chlorine, Coliform (Pre-TCR), Coliform (TCR).
A past EPA health-based registry row does not describe water delivered today or current compliance status; utilities notify customers and remediate under state primacy oversight when required. For current water-quality status and treatment practices, review your local utility's most recent Consumer Confidence Report or contact the California drinking water program. All records above reflect federal EPA SDWIS data and are not independently verified against state databases.
Community Water Systems
| System Name | Pop. Served | Violations | Status |
|---|---|---|---|
| LAND PROJECTS MUTUAL WATER CO. | 2,800 | 118 | Health |
| SUNDALE MUTUAL WATER COMPANY A, B | 1,050 | 0 | Clean |
| AVERYDALE MWC | 1,023 | 0 | Clean |
| WHITE FENCE FARMS MWC NO.3 | 749 | 0 | Clean |
| LANDALE MUTUAL WATER COMPANY | 550 | 0 | Clean |
| SHERWOOD MOBILE HOME PARK | 540 | 0 | Clean |
| ANTELOPE PARK MUTUAL WATER COMPANY | 445 | 0 | Clean |
| WESTERN SKIES MOBILE HOME PARK | 198 | 0 | Clean |
| METTLER VALLEY MUTUAL | 160 | 72 | Health |
| AQUA J. MUTUAL WATER COMPANY | 158 | 1 | Health |
| WILSONA GARDENS MUTUAL | 129 | 0 | Clean |
| EVERGREEN MUTUAL WATER COMPANY | 98 | 0 | Clean |
| LANCASTER WATER COMPANY | 80 | 2 | Health |
| REESEDALE MUTUAL | 76 | 0 | Clean |
| TIERRA BONITA MUTUAL WATER | 75 | 0 | Clean |
| LANCASTER PARK MOBILE HOME PARK | 60 | 63 | Health |
| BLEICH FLATS MUTUAL | 42 | 3 | Health |
| COLORADO MUTUAL WATER COMPANY | 39 | 1 | Health |
| MITCHELL'S AVENUE E MOBILE HOME PARK | 24 | 29 | Health |
Does this city have health-based water violations?
These health-based records can represent Maximum Contaminant Level (MCL), Treatment Technique (TT), or Maximum Residual Disinfectant Level (MRDL) categories. A historical record does not establish that water is currently unsafe.
| Water system | Contaminant | Begin Date |
|---|---|---|
| LANCASTER PARK MOBILE HOME PARK | Arsenic | 2025-07-01 |
| LAND PROJECTS MUTUAL WATER CO. | Arsenic | 2025-04-01 |
| LAND PROJECTS MUTUAL WATER CO. | Arsenic | 2025-04-01 |
| LANCASTER PARK MOBILE HOME PARK | Arsenic | 2025-04-01 |
| LAND PROJECTS MUTUAL WATER CO. | Arsenic | 2025-01-01 |
| LAND PROJECTS MUTUAL WATER CO. | Arsenic | 2025-01-01 |
| LANCASTER PARK MOBILE HOME PARK | Arsenic | 2025-01-01 |
| COLORADO MUTUAL WATER COMPANY | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| LAND PROJECTS MUTUAL WATER CO. | Arsenic | 2024-10-01 |
| LAND PROJECTS MUTUAL WATER CO. | Arsenic | 2024-10-01 |
| LAND PROJECTS MUTUAL WATER CO. | Arsenic | 2024-10-01 |
| LANCASTER PARK MOBILE HOME PARK | Arsenic | 2024-10-01 |
| LANCASTER PARK MOBILE HOME PARK | Arsenic | 2024-10-01 |
| LAND PROJECTS MUTUAL WATER CO. | Arsenic | 2024-07-01 |
| LAND PROJECTS MUTUAL WATER CO. | Arsenic | 2024-07-01 |
| LANCASTER PARK MOBILE HOME PARK | Arsenic | 2024-07-01 |
| LANCASTER PARK MOBILE HOME PARK | Arsenic | 2024-07-01 |
| LAND PROJECTS MUTUAL WATER CO. | Arsenic | 2024-04-01 |
| LAND PROJECTS MUTUAL WATER CO. | Arsenic | 2024-04-01 |
| MITCHELL'S AVENUE E MOBILE HOME PARK | Arsenic | 2024-04-01 |
| MITCHELL'S AVENUE E MOBILE HOME PARK | Arsenic | 2024-04-01 |
| METTLER VALLEY MUTUAL | Arsenic | 2024-04-01 |
| METTLER VALLEY MUTUAL | Arsenic | 2024-04-01 |
| LANCASTER PARK MOBILE HOME PARK | Arsenic | 2024-04-01 |
| LANCASTER PARK MOBILE HOME PARK | Arsenic | 2024-04-01 |
| LAND PROJECTS MUTUAL WATER CO. | Arsenic | 2024-01-01 |
| LAND PROJECTS MUTUAL WATER CO. | Arsenic | 2024-01-01 |
| LAND PROJECTS MUTUAL WATER CO. | Arsenic | 2024-01-01 |
| MITCHELL'S AVENUE E MOBILE HOME PARK | Arsenic | 2024-01-01 |
| MITCHELL'S AVENUE E MOBILE HOME PARK | Arsenic | 2024-01-01 |
| METTLER VALLEY MUTUAL | Arsenic | 2024-01-01 |
| METTLER VALLEY MUTUAL | Arsenic | 2024-01-01 |
| METTLER VALLEY MUTUAL | Arsenic | 2024-01-01 |
| LANCASTER PARK MOBILE HOME PARK | Arsenic | 2024-01-01 |
| LANCASTER PARK MOBILE HOME PARK | Arsenic | 2024-01-01 |
| LAND PROJECTS MUTUAL WATER CO. | Arsenic | 2023-10-01 |
| LAND PROJECTS MUTUAL WATER CO. | Arsenic | 2023-10-01 |
| LAND PROJECTS MUTUAL WATER CO. | Arsenic | 2023-10-01 |
| LAND PROJECTS MUTUAL WATER CO. | Arsenic | 2023-10-01 |
| MITCHELL'S AVENUE E MOBILE HOME PARK | Arsenic | 2023-10-01 |
| MITCHELL'S AVENUE E MOBILE HOME PARK | Arsenic | 2023-10-01 |
| LANCASTER PARK MOBILE HOME PARK | Arsenic | 2023-10-01 |
| LANCASTER PARK MOBILE HOME PARK | Arsenic | 2023-10-01 |
| LAND PROJECTS MUTUAL WATER CO. | Arsenic | 2023-07-01 |
| LAND PROJECTS MUTUAL WATER CO. | Arsenic | 2023-07-01 |
| LAND PROJECTS MUTUAL WATER CO. | Arsenic | 2023-07-01 |
| LAND PROJECTS MUTUAL WATER CO. | Arsenic | 2023-07-01 |
| MITCHELL'S AVENUE E MOBILE HOME PARK | Arsenic | 2023-07-01 |
| MITCHELL'S AVENUE E MOBILE HOME PARK | Arsenic | 2023-07-01 |
| METTLER VALLEY MUTUAL | Arsenic | 2023-07-01 |
What are Lancaster's health-based records for?
Lancaster's health-based violation records carry 5 distinct EPA codes: some name a substance, others the drinking-water rule that was breached. Counts are records on file in the EPA SDWIS extract, not current test results.
| Contaminant | Records | Systems |
|---|---|---|
| Arsenic | 278 | 4 |
| Coliform (Pre-TCR) | 5 | 3 |
| Chlorine | 4 | 1 |
| Coliform (TCR) | 1 | 1 |
| Lead and Copper Rule Revisions | 1 | 1 |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Lancaster, California? ▼
How many water violations does Lancaster have in this EPA extract? ▼
What contaminants were found in Lancaster water? ▼
How many water systems serve Lancaster? ▼
Where does Lancaster get its drinking water? ▼
How does Lancaster compare in California?
Of the 909 California places with at least one community water system on file, Lancaster ranks #16 by number of systems (19).
Either side of it: San Luis Obispo (20), Apple Valley (19), Redding (18), Oakdale (17)
About This Data
Figures here are the current EPA SDWIS extract joined to the 19 community water systems whose service area lists Lancaster, ranked against the 909 California places with at least one system on file. Data current as of 2026-08-25.
Water system data comes from the EPA's Safe Drinking Water Information System (SDWIS). PlainEnviro's violation fetch is restricted upstream to records EPA flags as health-based and then joined to active community water systems. Monitoring and reporting violations are not included.
A health-based violation row in this extract is a historical EPA registry entry. It does not describe water delivered today or current compliance status. Many records are later resolved, and public water systems notify customers when required. For current conditions, contact your local water utility or the state drinking water program.
TRI facility data comes from the EPA Toxic Release Inventory. Facilities shown are those that self-report to the TRI program. PlainEnviro presents this data without advocacy framing.
Read our methodology - how this data is sourced, computed, and verified.