GSWC-San Dimas
Drinking water quality, contact, and Consumer Confidence Report
Serving 5 cities in CA · PWSID CA1910142
GSWC-San Dimas serves 56,336 people. PFAS detected above health guidelines (Perfluorooctanesulfonic acid) — full contaminant breakdown below.
- People served
- 56,336
- Last EPA sample
- 2025-08-27
- PFAS
- Detected (1 compound)
- Health-based violations since 2020
- 0
Data sources: EPA SDWIS, GSWC-San Dimas's published Consumer Confidence Report, and compliance monitoring reported to EPA by CA State Water Resources Control Board, Div. of Drinking Water.
This page summarizes publicly available EPA and CCR records. For health decisions about your water, consult your utility or a licensed professional.
Help Paying Your GSWC-San Dimas Water Bill
- Ask GSWC-San Dimas about payment plans and assistance.
- Call 211 to reach local help with utility bills.Verified from 211.org
- Find your local Community Action Agency.Verified from communityactionpartnership.com
- The federal water-bill program (LIHWAP) ended in March 2024.Verified from acf.govVerified from csd.ca.gov
Programs that may apply to GSWC-San Dimas customers
- Customer Assistance Program (CAP)Bill discount from Golden State Water Company.Customers who meet its rules may qualify.Verified from gswater.com
Shutoff protections
- Water Shutoff Protection Act (SB 998), Health & Safety Code §116900 et seq.Shutoff protection from California Legislature (enforced by the State Water Resources Control Board).Verified from leginfo.legislature.ca.gov
Water outage or no water?
Boil water advisories are issued by water systems and state agencies, and they change from day to day. Boil water advisories in California
GSWC-San Dimas Service Area
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This map shows the approximate service area for GSWC-San Dimas. Actual coverage may vary. Contact the utility directly to confirm service availability at your address.
GSWC-San Dimas Water Quality Grade
Not graded: Monitor
GSWC-San Dimas reads Monitor. A letter grade is given only beside a Safe verdict.
Is GSWC-San Dimas Water Safe to Drink?
GSWC-San Dimas has reported 2 contaminants above EPA health-based guidelines (MCLGs) and 1 above EPA's legal limit (MCL, enforceable from April 26, 2029) in at least one city served. We recommend reviewing individual city reports below for specific water quality details.
This utility serves 56,336 people across 5 cities in CA. Water quality can vary by location within the service area. Check individual city pages below for detailed contaminant data specific to your area.
Get your water independently tested in California →How does California water quality rank nationally? →
Boil water advisories are issued by water systems and state agencies, and they change from day to day. Boil water advisories in California
Learn more about the contaminants detected in GSWC-San Dimas:
Fluoride in GSWC-San Dimas Water
GSWC-San Dimas
PWSID CA1910142
GSWC-San Dimas reported 0.465 mg/L, below the 0.7 mg/L U.S. Public Health Service recommendation.
GSWC-San Dimas Service Area
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GSWC-San Dimas Contact & Information
Phone
Mailing Address
B2B Contact Data
B2B Contact Data Available
Contacts for GSWC-San Dimas
| Name | Title | Phone | |
|---|---|---|---|
| J████ S████ | Water Treatment Supervisor | (555) ███-████ | j████@city████.gov |
| M████ J██████ | Utility Director | (555) ███-████ | m████@water████.org |
Water Sources & Treatment
Water Sources
Treatment Methods
Disinfectant Used
chloramines, chlorine, hypochlorite, ozone, uv light
GSWC-San Dimas Consumer Confidence Report
A Consumer Confidence Report (CCR) is the EPA-mandated annual water-quality report every community water system must publish by July 1 each year (Safe Drinking Water Act §1414(c)(4)). It summarizes contaminants tested, MCL and MCLG comparisons, and any system violations from the prior calendar year.
A current CCR for GSWC-San Dimas has not been published or validated on TapWaterData yet.
Residents: contact the utility directly using the phone number above, or check the EPA’s national CCR portal. Reports are typically distributed by mail or posted on the utility’s official website.
GSWC-San Dimas Annual Water Quality Reports
We don’t have a link we can confirm belongs to this system, and we’d rather show none than the wrong utility’s. CA State Water Resources Control Board, Div. of Drinking Water publishes drinking-water reports for systems in this state.
Visit CA State Water Resources Control Board, Div. of Drinking WaterWhat is a CCR? The Consumer Confidence Report (CCR) is an annual water quality report that water utilities are required by the EPA to provide to customers. It contains information about your water source, detected contaminants, and compliance status.
EPA Health-Based Violations Since 2020
GSWC-San Dimas has no health-based EPA violation since 2020 (EPA data as of Q2 2026).
EPA SDWA violation data as of Q2 2026 (downloaded 2026-07-09).
Concerned about what's in your water?
You're viewing 3 contaminants above health-based guidelines here. Your own tap water can differ — upload your test (PDF or a photo) and we'll email a full plain-English reading of every number, free.
Your upload also helps us keep local water data accurate — we only ever share anonymized, area-level summaries.
Upload my testRecommended Water Filters for GSWC-San Dimas
Based on water quality data from cities served by GSWC-San Dimas, we recommend NSF-certified filters that can remove contaminants above health guidelines.
Filter guides for the contaminants detected here:
Frequently Asked Questions about GSWC-San Dimas
Is GSWC-San Dimas water safe to drink?
Does GSWC-San Dimas have PFAS in its water?
How do I pay my GSWC-San Dimas water bill?
How many people does GSWC-San Dimas serve?
What cities does GSWC-San Dimas serve?
Does GSWC-San Dimas have any EPA violations?
What is GSWC-San Dimas's phone number?
Where can I find GSWC-San Dimas's Consumer Confidence Report?
Similar water utilities in California
How we built this page
Water-quality and contact data on this page comes from public federal and state records. We update each utility's record whenever its underlying source publishes new data — typically within days of an EPA SDWIS refresh.
- Contaminants & violations: EPA Safe Drinking Water Information System (SDWIS) plus the Unregulated Contaminant Monitoring Rule (UCMR-5) for PFAS and emerging contaminants.
- Annual reports: GSWC-San Dimas's most recent published Consumer Confidence Report (CCR), where available.
- Service area & contact: EPA SDWIS. The compliance records it holds for this system are reported to EPA by CA State Water Resources Control Board, Div. of Drinking Water, the state's drinking-water primacy agency.
Spotted a data issue? Use the Spotted something off? link at the bottom of the page — corrections feed back into the next data refresh. Learn more about TapWaterData.
Are you GSWC-San Dimas? Publish your 2027 CCR
TapWaterData runs a free CCR publishing service for community water systems. Claim this listing to publish your Consumer Confidence Report here — it inherits this page's search authority and reaches every customer who Googles GSWC-San Dimas.
- EPA-compliant distribution. Satisfies the 2027 Revised CCR Rule direct-URL requirement with an auditable archive.
- Publish once a year. Agent-assisted workflow; no login setup for small systems.
- Inherits this page's reach. Your published CCR appears directly on the page customers already find on Google.
Free for operators. No card required. Typical setup: 5 minutes.
Spotted something off on this page?
Residents keep our data honest.
This form corrects our data; it does not reach GSWC-San Dimas. For a problem with your water now (discolored water, no water, low pressure, a leak), contact GSWC-San Dimas directly.
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