1 open health-based violation on EPA record.
Serves about 524 people (207 connections) with groundwater bought from SFPUC-Pleasanton Wells.
From EPA's record for CA0105008. PurityMap is independent of Castlewood Domestic Water System.
Are you this utility? Correct this listing →
1 health-based violation in the last 10 years, from EPA's SDWIS compliance database.
| Period | Contaminant | Measured | Legal limit | EPA status |
|---|---|---|---|---|
| From October 2024 | Lead and copper rule revisions | – | – | Addressed |
No lab results for other contaminants (like PFAS) are on file for this system. EPA required that testing from systems serving more than 3,300 people, plus a sample of smaller ones.
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure
Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
Turnaround: 5 minutes
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
Environmental Testing and Research Laboratories (ETR Labs), Leominster, MA · ISO/IEC 17025:2017, ANAB certificate AT-2638 · 2–4 business days after the lab receives it
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
Get PurityMap updates about this water system.
Follow this water →Castlewood Domestic Water System's phone number on EPA record is 510-670-5241. Its mailing address is 707 Country Club Circle, PLEASANTON, CA 94566.
According to EPA's record, Castlewood Domestic Water System uses groundwater bought from SFPUC-Pleasanton Wells.
EPA's record shows 1 health-based violation for Castlewood Domestic Water System in the 10 years to July 9, 2026. EPA's record lists 1 open health-based violation. EPA also lists 1 missed or late test or report in 10 years. The record comes from EPA's SDWIS compliance database.
The 90th-percentile lead result in Castlewood Domestic Water System's latest lead and copper round, which ended in December 2023, was 41 µg/L, above the federal action level of 15 µg/L.
PurityMap has no verified website for Castlewood Domestic Water System. Its phone number on EPA record is 510-670-5241. Its mailing address on EPA record is 707 Country Club Circle, PLEASANTON, CA 94566. Your water bill lists the ways to contact your supplier and pay. PurityMap does not take payments.