Community Water System · PWSID CA4200848

Vista Hills Mutual Water Company

Serves 75 peopleGroundwaterOwner: PrivateLompoc, 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 2002: 8 violations. 1 over the limit · 4 missed or late tests · 3 notices or reports. Most recent began 2025-01-01.

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

1Over the limit
0Treatment lapse
4Missed or late test1 open
3Notice or report

More violations on record than 85% 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

2002 · Notice or report: 120052006 · Notice or report: 12007 · Notice or report: 1201020152017 · Missed or late test: 12018 · Missed or late test: 22018 · Missed or late test: 220202023 · Missed or late test: 12025 · Over the limit: 12025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
13% over the limit · 150% missed or late test · 438% notice or report · 3

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

How far over the limit

at the limit2×5×10×100×+Selenium2025-01-01 · Selenium: measured 67.50 UG/L vs limit 50.00 UG/L (1.4×)
Each dot is one over-the-limit violation: the measured value divided by the limit it broke, on a log scale. Most legal limits for chemicals are running averages set for a lifetime of drinking, so “just over” and “ten times over” are very different news. Hover a dot for the numbers.

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 2 results on file · action level 15 ppb

3.2 ppb
0 ppb

Open now (1)

  1. 2023-10-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/ROpen

Every violation on record

  1. 2025-01-01SeleniumMCL, Averagemeasured 67.50 UG/L · limit 50.00 UG/LPeriod ended · no return to compliance on file
  2. 2023-10-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/ROpen
  3. 2018-06-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance
  4. 2018-01-01NitrateMonitoring, RegularBack in compliance
  5. 2017-10-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance
  6. 2007-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  7. 2006-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance
  8. 2002-07-01Consumer Confidence RuleCCR Complete Failure to ReportBack in compliance

System details

Population served75
Service connections22
Water sourceGroundwater
System typeCommunity Water System
OwnerPrivate
StatusActive
CityLompoc
EPA ZIP on file93436

Areas served

  • Santa Barbara County

Reading this record

Vista Hills Mutual Water Company is a community water system that draws from groundwater and serves about 75 people in Lompoc, 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.