Community Water System · PWSID CA3610023

Green Valley Mwc

Serves 2,993 peopleSurface Water PurchasedOwner: PrivateGreen Valley Lake, California
Nothing open right now.

On record since 1993: 4 violations. 2 over the limit · 2 missed or late tests. Most recent began 2024-10-01.

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

2Over the limit
0Treatment lapse
2Missed or late test
0Notice or report

More violations on record than 71% 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

1993 · Over the limit: 1199520002005201020152017 · Missed or late test: 120202023 · Missed or late test: 12024 · Over the limit: 12025
One square = one violation, by the year it began. Empty columns are years with nothing on EPA's record.
50% over the limit · 250% missed or late test · 2

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×+Combined Uranium2024-10-01 · Combined Uranium: measured 23.25 PCI/L vs limit 20.00 PCI/L (1.2×)
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 5 results on file · action level 15 ppb

24.9 ppb
14.8 ppb
12.7 ppb
7.9 ppb
0 ppb

Copper, 90th percentile 1 result on file · action level 1.3 mg/L

1.7 mg/L

Every violation on record

  1. 2024-10-01Combined UraniumMCL, Averagemeasured 23.25 PCI/L · limit 20.00 PCI/LPeriod ended · no return to compliance on file
  2. 2023-02-01E. ColiMonitoring, Source Water (GWR)Back in compliance
  3. 2017-10-01Lead and Copper RuleFollow-up Or Routine LCR Tap M/RBack in compliance
  4. 1993-07-01Coliform (TCR)MCL, Monthly (TCR)Back in compliance

System details

Population served2,993
Service connections1,069
Water sourceSurface Water Purchased
System typeCommunity Water System
OwnerPrivate
StatusActive
CityGreen Valley Lake
EPA ZIP on file92341

Areas served

  • San Bernardino County

Reading this record

Green Valley Mwc is a community water system that draws from surface water purchased and serves about 2,993 people in Green Valley Lake, 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.