Community Water System · PWSID CA3710002

Vallecitos Wd

Serves 113,500 peopleSurface Water PurchasedOwner: Local GovernmentSan Marcos, California
Nothing open that measures the water, but 1 open testing or paperwork violation.

A missed test is not evidence of bad water. It also is not evidence of good water: for that period nobody checked.

On record since 2025: 1 violation. 1 notice or report. Most recent began 2025-07-02.

For this year's test results, ask the utility for its annual Consumer Confidence Report. Every community system must publish one.

0Over the limit
0Treatment lapse
0Missed or late test
1Notice or report1 open

More violations on record than 36% of active water systems in California. Small systems with no staff chemist often rack up missed-test violations; big utilities rarely do.

The record, year by year

20052010201520202025 · Notice or report: 12025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
100% notice or report · 1

Across California, 52% of violations are missed or late tests and 29% are water over a limit.

Lead & copper at the tap

Utilities sample taps in homes most likely to have lead pipes, and report the 90th-percentile result: 9 in 10 homes sampled came in at or below this number. Above the red line (the action level) the utility must act. The action level is not a safe level; EPA's health goal for lead is zero. EPA's file does not date these results, so they are shown highest first.

Lead, 90th percentile 6 results on file · action level 15 ppb

1.1 ppb
0 ppb
0 ppb
0 ppb
0 ppb
0 ppb

Open now (1)

  1. 2025-07-02Lead service line inventoryRPTOpen

Every violation on record

  1. 2025-07-02Lead service line inventoryRPTOpen

System details

Population served113,500
Service connections22,501
Water sourceSurface Water Purchased
System typeCommunity Water System
OwnerLocal Government
StatusActive
CitySan Marcos
EPA ZIP on file92069

Areas served

  • San Diego County

Reading this record

Vallecitos Wd is a community water system that draws from surface water purchased and serves about 113,500 people in San Marcos, California. Everything above comes from the EPA's Safe Drinking Water Information System (SDWIS), where states report every violation by every public water system.

Four kinds of violation. Only one is a measurement of the water: over the limit means a test came back above a legal maximum (an MCL). A treatment lapse means a required protective step was not done, such as disinfection, filtration, fixing a defect an inspector found, or filing a lead-pipe inventory. A missed or late test means a required test was skipped or never reported. That is the most common kind, and the most misread: it does not mean the water was bad, and it does not mean the water was fine. Notices and reports covers public notices and the annual Consumer Confidence Report.

Status. “Back in compliance” means the state recorded a return to compliance. “Period ended” means the violation's compliance period is over but no return to compliance was ever filed, which is common in older records. EPA's federal copy lags state records by months, so call the utility for anything current.