Rancho Cucamonga Water Quality
California
According to EPA SDWIS, Rancho Cucamonga, California is served by 7 community water systems covering about 1,553 people. The same extract lists 7 health-based violation records, most recently coded 5200 in 2024. Counts are historical EPA registry rows, not a current compliance or drinkability score.
Drinking water in Rancho Cucamonga, California is delivered through 7 EPA-regulated community water systems serving an estimated 1,553 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 7 violation records across the 7 active community systems shown here. Monitoring and reporting records are not present in the extract. The records carry 4 distinct EPA contaminant codes: LEAD AND COPPER RULE REVISIONS, Coliform (Pre-TCR), Heterotrophic Bacteria (HPC or SPC), Arsenic. 14 TRI-reporting industrial facilities are also located within the city limits.
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 |
|---|---|---|---|
| LAGUNA MOBILE HOME AND RV PARK | 450 | 5 | Health |
| CALIFORNIAN MOBILE HOME PARK | 372 | 1 | Health |
| EL RANCHO MOBILE HOME PARK | 215 | 0 | Clean |
| DESERT PALMS MOBILE HOME PARK | 140 | 0 | Clean |
| TERRA NOVA MOBILE HOME PARK | 140 | 0 | Clean |
| CLEAR SKIES MOBILE HOME PARK | 131 | 1 | Health |
| MONO VISTA RANCH MHP | 105 | 0 | Clean |
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 |
|---|---|---|
| LAGUNA MOBILE HOME AND RV PARK | LEAD AND COPPER RULE REVISIONS | 2024-10-17 |
| CLEAR SKIES MOBILE HOME PARK | Coliform (Pre-TCR) | 2020-05-01 |
| CALIFORNIAN MOBILE HOME PARK | Heterotrophic Bacteria (HPC or SPC) | 2019-09-01 |
| LAGUNA MOBILE HOME AND RV PARK | Arsenic | 2016-07-01 |
| LAGUNA MOBILE HOME AND RV PARK | Arsenic | 2016-04-01 |
| LAGUNA MOBILE HOME AND RV PARK | Arsenic | 2016-01-01 |
| LAGUNA MOBILE HOME AND RV PARK | Arsenic | 2015-10-01 |
What are Rancho Cucamonga's health-based records for?
Rancho Cucamonga's health-based violation records carry 4 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 | 4 | 1 |
| Coliform (Pre-TCR) | 1 | 1 |
| Heterotrophic Bacteria (HPC or SPC) | 1 | 1 |
| Lead and Copper Rule Revisions | 1 | 1 |
TRI Facilities in Rancho Cucamonga
| Facility | Total Releases |
|---|---|
| Tamco | 542.4K lbs |
| Bluescope Coated Products LLC | 146.9K lbs |
| Precision Aerospace Corp | 54.5K lbs |
| Schlosser Forge Co | 15.9K lbs |
| Frito-Lay Inc.(f/k/a Frito-Lay North America) | 12.8K lbs |
| Arlon Emd | 9.5K lbs |
| Parallel Products of California | 7.2K lbs |
| Pac Rancho Foundry | 3.3K lbs |
| Steelscape LLC | 3.2K lbs |
| Vorteq - Pacific | 3.0K lbs |
Frequently Asked Questions
What does EPA SDWIS list for drinking water in Rancho Cucamonga, California? ▼
How many water violations does Rancho Cucamonga have in this EPA extract? ▼
What contaminants were found in Rancho Cucamonga water? ▼
How many water systems serve Rancho Cucamonga? ▼
Where does Rancho Cucamonga get its drinking water? ▼
Are there pollution sources near Rancho Cucamonga? ▼
How does Rancho Cucamonga compare in California?
Of the 909 California places with at least one community water system on file, Rancho Cucamonga ranks #90 by number of systems (7).
Either side of it: Needles (7), Oroville (7), Riverside (7), Santa Cruz (7)
About This Data
Figures here are the current EPA SDWIS extract joined to the 7 community water systems whose service area lists Rancho Cucamonga, 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.