MyTapWater.us

PWSID CA2110007

COAST SPRINGS - CAL. WATER SERVICE (PUC)

Community water system based in San Jose, CA

Service area on file with EPA: Marin County. EPA's recorded service area can be incomplete for regional authorities. The cities and counties above are what the utility has filed with EPA; the utility may serve additional areas.

Population served
388
Source
Surface water
Status
Active

At a glance

2 findings worth watching

Risk classification follows EPA's published values for safe drinking water, with caution and concern bands reviewed by a clinician. Past resolved violations do not influence this card. See methodology.

Lead service line inventory

Service line inventory still in progress

COAST SPRINGS - CAL. WATER SERVICE (PUC) reports 0 confirmed lead service lines, 0 non-lead, 253 unknown (total 253) in the EPA SDWIS service line inventory (2026Q1). EPA's Lead and Copper Rule Revisions treat unknown and galvanized-requiring-replacement lines as lead for notification and replacement scheduling until verified.

  • 0 confirmed lead service lines
  • 0 galvanized requiring replacement (LCRI treats these as lead)
  • 253 unknown (100.0% of total)
  • 0 confirmed non-lead (0.0%)
  • 253 total service lines in the system
What to do if your service line might be lead
  1. Ask your utility to check the service-line classification for your specific address. Many utilities provide a public address-lookup tool linked from the inventory page.
  2. Get on the replacement queue. Under the LCRI, utilities must replace all lead and galvanized-requiring- replacement lines within 10 years (clock generally starts November 2027). Some prioritize requests.
  3. Until the line is replaced: flush the tap 30 seconds after long stagnation, use cold water for drinking and cooking, and consider an NSF/ANSI 53 lead-rated tap filter.
  4. Talk to your clinician about a blood lead test for anyone in the home, especially a pregnant person or a child under 6. Lead in drinking water guide.

Inventory data sourced from COAST SPRINGS - CAL. WATER SERVICE (PUC) ( retrieved May 24, 2026 ; curator confidence: medium ). Confirmed against the original source automatically each month; see methodology.

Lead and copper test results

The most recent measurement per contaminant from EPA's Lead and Copper Rule sampling.

Why only lead and copper, and not arsenic, nitrate, or others?

EPA's bulk SDWIS download is the only nationwide per-system sample data they publish, and it only includes the Lead and Copper Rule table. Values for other regulated contaminants (TTHMs, nitrate, arsenic, etc.) appear on this page only when they trigger a violation. For the full per-system contaminant suite, see the utility's annual Consumer Confidence Report (link further down the page).

Most recent measurements per contaminant (Lead and Copper Rule) . Sorted by risk: concern first, then caution, then unrated, then safe.
Contaminant Most recent Date Risk
Lead
PB90
 0.0014 mg/L December 31, 2024 Caution

Data from EPA SDWIS (Lead and Copper Rule sample table) , last refreshed May 24, 2026.

Fluoride

Per CDC My Water's Fluoride

COAST SPRINGS - CAL. WATER SERVICE (PUC) does not add fluoride to its drinking water.

This system has not reported adding fluoride to its water on CDC's My Water's Fluoride listing. Natural fluoride may still be present at trace levels from the source water; the utility's annual water quality report has the latest measured concentration.

Source: CDC My Water's Fluoride, listed under Coast Springs - Cal. Water Service (Puc) (Marin County). Verify on CDC's site .

Area context

Marin County, CA (2020 data)

Community water systems
1 of 13 add fluoride
Population on fluoridated water
182,575 of 190,383 (95.9%)

California statewide (2020 data)

Population on fluoridated water
21,879,582 of 38,051,212 (57.5%)
Community water systems adding fluoride
417 of 3,057

Data from CDC My Water's Fluoride (per-system status) , last refreshed May 19, 2026.

Data from CDC Water Fluoridation Reporting System (state and county aggregates) , last refreshed May 16, 2026.

Compliance history

EPA-recorded violations against this system over the last 5 years.

How to read this section

Health-based violations are when a measured limit was exceeded; the measured concentration is shown alongside the EPA federal limit where SDWIS published it. Monitoring and reporting items are paperwork issues (missed sample dates, late filings) that do not themselves indicate unsafe water.

Clean record

No violations on file for this system in the last 5 years.

Data from EPA SDWIS (violation records) , last refreshed May 24, 2026.

Where to see every contaminant this utility tested for

EPA's bulk SDWIS dataset gives MyTapWater.us per-system measured values for lead and copper, plus violation records for everything else. To see every regulated contaminant this utility tested for in the past year (TTHMs, HAA5, nitrate, arsenic, fluoride, chromium, etc.) with measured values, read the utility's Consumer Confidence Report (CCR).

Every community water system is required by EPA to publish a CCR annually, by July 1, listing every contaminant they sampled, the measured value, the federal limit, and any health-based exceedances. Most utilities post the report online; some mail it with your bill.

How to find COAST SPRINGS - CAL. WATER SERVICE (PUC)'s CCR:

Other water systems in Marin County, CA

Compare nearby utilities by population served.

Contact this utility

Public administrative contact information for this water system, as filed with the EPA. Use this to ask about your service line, request your home's lead status, or report a water quality issue.

Administrator
JAMES, SOPHIE
Phone
408-367-8593
Email
sjames@calwater.com
Mailing address
1720 NORTH FIRST STREET
SAN JOSE, CA 95112

Where this page's data comes from

Bundle released 2026-Q2, regenerated May 24, 2026. Each section above also shows its own source date so you can tell at a glance how fresh that part of the page is.

Every value on this page is cross-verified before publication; read our methodology for the verification steps and corrections process.