Payment channels

Pay California Water Service Company - Bayshore District, San Mateo System

Use the provider’s verified online, telephone, mail, or counter instructions. Check the final confirmation screen for the amount, processing date, and any transaction fee before submitting.

Primary online route

Use the official payment portal

The direct portal is the fastest route when it is available. The provider identifies its payment gateway as California Water Service My Account / guest bill-pay portal. Never enter account credentials into a lookalike site reached through an unsolicited message.

Open payment portal ↗

Telephone payment

Phone IVR

(888) 598-9824, Cal Water's automated payment number for the Bayshore District.

Have your account number and payment instrument ready. Follow the provider’s recorded prompts and retain the confirmation number.

Alternative channels

Mail, text, and in-person payment instructions

Pay by text

A dedicated this detail was not publicly posted. The reviewed current Bayshore and My Account pages provide account login, guest payment and assistance features but do not publish a verified text-to-pay keyword or SMS enrollment sequence.

Mail-in address

California Water Service, P.O. Box 7229, San Francisco, CA 94120-7229.

Counters, drop boxes, and office hours

Cal Water directs Bayshore customers to its customer-center and payment-options pages and states that cash, check, money order, credit card, debit card or bank-account payments may be available depending on the location or method. The reviewed Bayshore page does not publish one San Mateo counter address and hours or a single local drop-box list; customers should use the district locator before visiting.

Accepted digital instruments

What you can use online

Cal Water accepts credit card, debit card and bank-account payments through its digital account and payment channels; the district also lists cash, checks and money orders for applicable in-person methods. Available instruments vary by payment location and method. The reviewed pages do not identify Apple Pay or Google Pay for this district.

2026 transaction pricing

Convenience fees

A dedicated this detail was not publicly posted. The reviewed current Cal Water Bayshore pages do not publish a single 2026 online card or e-check convenience surcharge.

Fees can vary by payment type, channel, account class, and processor terms. The checkout screen is the final fee disclosure.

Payment guidance

Choose the payment channel that fits your deadline

The safest payment path is the one published by California Water Service Company - Bayshore District, San Mateo System and matched to the account information on your bill. Online portals are convenient, but telephone, mail, counter, and drop-box options may follow different posting schedules and may use different fees.

For a routine payment, save the final confirmation page or IVR number and check when the transaction will post. For a same-day shut-off notice, do not assume that submitting a card payment automatically stops a field order; ask the provider what amount and confirmation are required.

Never send your account number, password, card details, or bank information to Water Ledger. Those details belong only on the provider’s verified payment channel or at an authorized counter.

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