San Marcos Water Utility: Pay, Log In, Call, Start Service or Fix a High Bill
Use this 2026 guide for City of San Marcos utility customers who need the official Customer Connect portal, one-time payment, AutoPay, pay-by-phone number, Utility Billing phone, office address, mail address, drop boxes, H-E-B payment option, start/stop service rules, disconnection restoration steps, 2026 water and sewer rates, stormwater and garbage lines, leak adjustment packet, payment assistance, Stage 3 drought restrictions and water-quality contacts.
Start Here: Fast San Marcos Utility Action Board
User need |
Official route |
Have ready |
San Marcos-specific next step |
|---|---|---|---|
Pay or log in online |
Account number and mailing ZIP code exactly as listed on account. |
Use Customer Connect for one-time payment, online account registration, AutoPay, usage alerts and service requests. |
|
Make a phone payment |
Account number, billing ZIP, eCheck or Visa/MasterCard/Discover card. |
Use only for current utility payments; interrupted service cannot be restored through automated payment alone. |
|
Ask billing question |
Account number, service address, bill copy and payment confirmation if paid. |
Customer Service representatives are available Monday-Friday, 8 a.m.-5 p.m. |
|
Pay in person / drive-through |
Utility Billing, 1040 Highway 123 (Seguin Highway). |
Bill/account number and payment method. |
Office has walk-in lobby and drive-through during normal business hours. |
Mail payment |
636 E Hopkins, San Marcos, TX 78666. |
Check or money order and account number. |
Mail early enough to arrive before the due/disconnection date shown on the billing cycle. |
Use after-hours drop box |
630 E Hopkins or 1040 Highway 123. |
Check or money order in secure envelope with account number. |
Do not leave cash in drop boxes. |
Pay at H-E-B / Western Union |
H-E-B at 641 E Hopkins or 200 W Hopkins. |
Billing statement, cash/check/money order and $1 cash service fee. |
Accounts are credited the next business day, so this is not ideal for same-day disconnection risk. |
Service already disconnected |
Call Utility Customer Services or visit 1040 Highway 123. |
Account number, service address, full payment proof and phone number. |
Online and automated phone payments cannot restore utilities after nonpayment interruption. |
Open, transfer or close account |
Photo ID, SSN, service address, requested date, deposit information and forwarding address if closing. |
New accounts and closes cannot be handled by telephone request alone. |
|
Water/wastewater emergency |
Exact address, cross street, water leak/no-water/sewer issue and safety risk. |
Use for water or wastewater emergencies, not ordinary bill questions. |
Quick answer: San Marcos utility customers should use Customer Connect for online pay/login and AutoPay, call 512-393-8383 option 3 for billing help, call 512-393-8333 or 512-393-8383 option 2 for phone payment, visit 1040 Highway 123 for in-person service, and call 512-393-8300 for electric or water/wastewater emergencies.
Provider Check: Water, Wastewater, Electric, Garbage or Drainage?
San Marcos utility accounts can bundle multiple City services in one bill. Residential customers may see electric, water, wastewater, garbage/recycling and drainage/stormwater on one statement, so a high bill is not always a water-use problem.
Water
Water charges depend on meter size, inside/outside-city status and gallon tiers.
Wastewater
Residential sewer is tied to winter averaging and has important caps for common residential meter sizes.
Electric
San Marcos also provides electric service to many addresses, so summer or winter usage can drive the total bill.
Stormwater / garbage
Drainage and resource recovery lines are separate from gallons used.
Bill line / problem |
Correct route |
Why it matters |
|---|---|---|
Water use seems high |
Customer Connect usage threshold tools plus Utility Billing. |
Daily/monthly alerts can reveal leaks, irrigation spikes or unusual use. |
Sewer charge seems high |
Wastewater rates page and Utility Billing. |
Residential sewer is based on prior December, January and February meter reads; new accounts without history are set at 5,000 gallons. |
Community Benefit line item appears |
Utility rates pages / Community Benefit notice. |
Starting June 2026, this existing cost is shown separately for transparency; the City says it is not a new additional charge. |
Drainage/stormwater charge |
Stormwater Utility Fee Information. |
It is based on impervious cover class, not monthly water use. |
Garbage/recycle charge |
Resource Recovery rates / curbside services. |
Trash cart size, extra carts and multifamily recycling can change the bill. |
Provider boundary question |
City CCN page and Utility Billing. |
The water/wastewater CCN controls where San Marcos is the retail service provider. |
Official San Marcos Utility Billing Phone Numbers and Office
Utility Billing Customer Service
Phone: 512-393-8383 option 3
Email: utility_billing@sanmarcostx.gov
Hours: Monday-Friday, 8 a.m.-5 p.m.
Utility Billing Office
Address:
1040 Highway 123
San Marcos, TX 78666
Walk-in lobby and drive-through are available during normal business hours.
Emergency / Outage
Electric & Water/Wastewater Emergency:
512-393-8300
Use for emergency service problems, not routine billing.
Contact route |
Use for |
What to say first |
|---|---|---|
512-393-8383 option 3 |
Billing questions, portal help, arrangements, service start/stop/transfer, disconnection status and account help. |
“My San Marcos utility account/service address is [address], and I need help with [issue].” |
512-393-8383 option 2 |
Phone payment route listed from Customer Connect instructions. |
Have account number and payment method ready. |
512-393-8333 |
Automated telephone payment route listed on the City pay page. |
Use for current bill payment by eCheck or card. |
utility_billing@sanmarcostx.gov |
Non-urgent billing documents, portal questions, payment assistance follow-up and leak paperwork. |
Include name, account number, service address and short explanation. |
1040 Highway 123 |
In-person payment, drive-through payment, start/stop forms, disconnected-service help and deposit questions. |
Bring photo ID, bill/account number and proof of payment if recently paid. |
512-393-8300 |
Electric or water/wastewater emergency, known outages and urgent utility field issue. |
Give exact address/cross street and describe the emergency before account questions. |
Fraud warning: the City warns customers to hang up if a caller demands payment, threatens immediate shutoff, asks for gift cards or requests personal information. Call Utility Billing directly at the official number before paying.
Bill Pay and Login: Exact San Marcos Payment Steps
1. Open Customer Connect
Use connect.sanmarcostx.gov for online payment, account registration, AutoPay and usage alerts.
2. Enter account details
Use account number and mailing ZIP code exactly as shown on the utility account.
3. Choose payment
Pay one time or register for AutoPay, phone payment, office payment, mail, drop box or H-E-B.
4. Save proof
Keep date, amount, account number, payment method and confirmation number.
Payment method |
How it works |
Best for |
Do not miss |
|---|---|---|---|
Customer Connect online payment |
Pay online 24/7 from the City’s payment portal. |
Fast online payment and account management. |
Payments above $50,000 are declined through one-time payment and AutoPay options. |
AutoPay |
Register your account in Customer Connect and set payment method. |
Customers who want recurring payment. |
If AutoPay is declined, the program will not re-run that bill cycle; pay the current bill another way. |
Phone payment |
Use automated phone payment with eCheck or Visa/MasterCard/Discover. |
Current bill payment without visiting office. |
Automated payment cannot restore disconnected service after nonpayment. |
In-person / drive-through |
Pay at 1040 Highway 123, Monday-Friday, 8 a.m.-5 p.m., excluding holidays. |
Disconnection risk, receipt, deposit and start/stop service help. |
Use office route when the account is interrupted or scheduled for urgent action. |
Mail |
Mail payment to 636 E Hopkins, San Marcos, TX 78666. |
Non-urgent check/money-order payment. |
Mail delay can create late/disconnection risk. |
Drop box |
Night deposit boxes at 630 E Hopkins and 1040 Highway 123. |
After-hours check/money-order drop-off. |
Do not leave cash in drop boxes. |
H-E-B / Western Union Convenience Pay |
Pay at H-E-B locations on 641 E Hopkins or 200 W Hopkins. |
Cash/check/money-order customers with bill in hand. |
$1 cash service fee; accounts credited next business day. |
Interrupted service restoration |
Call Utility Customer Services or visit the office. |
Disconnected for nonpayment. |
Online or automated phone payments will not restore utilities by themselves. |
Start, Stop or Transfer San Marcos Utility Service
Open new account
- City provides electric, water and wastewater services; residential customers also receive garbage and recycling.
- New accounts cannot be opened by telephone request.
- In person: bring photo ID, complete connect request and pay deposit if required.
- Mail requests must include ID copy, deposit, service address, requested date, phone and SSN.
Transfer service
- Customer Connect users can submit transfer requests online 24/7.
- Include requested disconnection date and new connection date.
- Deposits are not transferable to the new address.
- If no Customer Connect account, visit 1040 Highway 123.
Close account
- Telephone close requests are not accepted.
- Close online through Customer Connect, in person, by mail, UPS/FedEx or fax.
- Include government ID copy, service address, forwarding address and requested disconnection date.
- Disconnections are weekdays only, 8 a.m.-5 p.m., excluding holidays.
Deposit waiver
- A qualifying letter of credit can waive deposit.
- Letter must show 12 on-time bills, no NSF payments and no disconnections.
- Active-duty military and honorably separated U.S. veterans may qualify for waiver.
- Waived veteran deposits can become due if delinquency rules are broken.
Move-in tip: connection requests are completed weekdays from 8 a.m. to 5 p.m., excluding holidays, and a specific time cannot be guaranteed. Connection fees are included on the first bill, and deposits are handled separately from the old account.
2026 San Marcos Water, Wastewater, Stormwater and Garbage Rates
San Marcos water and wastewater rates became effective October 1, 2025. The City says rates are not changing on June 22, 2026, but some parts are being broken out into a separate Community Benefit section so bills display differently.
5/8"–3/4" water minimum
$30.19 June 22, 2026 inside-city water minimum, plus separate Community Benefit components.
First water tier
$5.17 per 1,000 gallons for 0-6,000 gallons on 5/8"–3/4" inside-city meter.
5/8"–3/4" sewer minimum
$31.76 June 22, 2026 inside-city wastewater minimum, plus Community Benefit components.
Typical stormwater
$14.90 FY2026 typical residential stormwater fee.
Inside-city water item, 5/8"–3/4" meter |
June 22, 2026 amount |
Bill-review meaning |
|---|---|---|
Minimum charge | $30.19 | Base water line for common residential meter. |
Community Benefit: Customer Assistance | $0.06 | Shown separately for transparency. |
Community Benefit: Conservation / Energy Efficiency | $0.70 | Supports conservation/efficiency programs. |
Community Benefit: Franchise Fee | $1.81 plus 6% of gallon charges | Previously included in base rates; now shown separately. |
0 to 6,000 gallons | $5.17 per 1,000 gallons | First usage tier for common residential meter. |
6,001 to 9,000 gallons | $9.066 per 1,000 gallons | Outdoor watering/leak review begins to matter. |
9,001 to 12,000 gallons | $10.368 per 1,000 gallons | Check irrigation schedule and continuous use. |
12,001 to 20,000 gallons | $11.67 per 1,000 gallons | High-use tier for many homes. |
20,001 to 50,000 gallons | $12.953 per 1,000 gallons | Major irrigation, leak or large-use check. |
Over 50,000 gallons | $15.528 per 1,000 gallons | Very high use; investigate quickly. |
Wastewater / stormwater / garbage item |
2026 detail |
High-bill meaning |
|---|---|---|
Inside-city sewer 5/8"–3/4" minimum | $31.76 June 22, 2026 | Fixed sewer line before gallon charge. |
Inside-city sewer over 2,000 gallons | $9.16 per 1,000 gallons | For common residential meter; franchise fee also shown separately. |
Residential sewer averaging | Based on previous December, January and February meter readings. | Ask which winter reads were used if sewer looks wrong. |
No history sewer setting | Accounts without Dec/Jan/Feb history are set at 5,000 gallons. | Important for new customers and recent move-ins. |
Residential sewer cap | No additional charge above 9,000 gallons for common 5/8"–1.5" residential meters. | Helps separate water irrigation from sewer billing. |
Stormwater small residential | $9.14 FY2026 | Based on impervious cover class. |
Stormwater typical residential | $14.90 FY2026 | Common drainage line, not gallon use. |
Stormwater large residential | $21.77 FY2026 | Higher impervious-cover class. |
Nonresidential stormwater | $14.90 per ERU; ERU is 2,575 sq. ft. | Applies to commercial, industrial, retail, government and larger multifamily. |
Garbage/recycle 65-gallon trash cart | $31.26 effective October 1, 2025 | Includes recycling/green waste and listed program services. |
Garbage/recycle 96-gallon trash cart | $36.26 effective October 1, 2025 | Cart size can change monthly total. |
Community Benefit note: the new line item appears on June 2026 bills for transparency. The City says it applies to electric, water and wastewater and supports utility assistance, roadway lighting and conservation programs.
Late Bills, Disconnection, Payment Assistance and Leak Adjustments
Disconnected service
Online and automated phone payments cannot restore utilities interrupted for nonpayment.
Billing cycles
San Marcos bills monthly in four cycles, with due and disconnection dates tied to service address.
Assistance
Qualified customers may receive utility-bill assistance up to four times per fiscal year.
Leak packet
Leak-adjustment review can take about 10-14 business days after complete information is submitted.
Situation |
Official rule / route |
Customer next step |
|---|---|---|
Due date or disconnection date falls on weekend/holiday |
City moves it forward to next business day and shows modified dates on billing statement. |
Use the date printed on your bill, not memory from last month. |
Utilities interrupted for nonpayment |
Contact Utility Customer Services or visit 1040 Highway 123. |
Do not rely on online/automated payment to restore service. |
Need extended payment arrangement |
Email Utility Billing, call 512-393-8383 or visit the office. |
Ask before disconnection date and explain amount you can pay now. |
Utility Payment Assistance Program |
Assistance is for City utility bills only, not deposits or excluded fees. |
Ask whether current bill, up to 60 days past due and late fees are eligible. |
Assistance frequency |
Qualified customers may receive support up to four times per fiscal year, October 1-September 30. |
Track prior assistance received in the current fiscal year. |
Excluded fees |
Tampering fees, connection fees and after-hours connection fees are not covered. |
Separate base bill from excluded fees before applying. |
Leak adjustment |
Specific leak adjustments are not more than two months retroactive and bills adjusted do not exceed two. |
Repair leak, complete form, attach support documents and keep paying current bills by due date. |
Leak review timing |
Completed leak-adjustment review takes about 10-14 business days. |
Submit complete packet to Utility Customer Service or utility_billing@sanmarcostx.gov. |
Usage Alerts, Stage 3 Drought, Rebates and Water-Saving Checks
Daily water alerts
Customer Connect thresholds include daily water alerts at 150, 250, 350, 1,500 or 20,000 gallons.
Monthly water alerts
Monthly water thresholds include 5,000, 7,500 or 9,999 gallons.
Stage 3 drought
San Marcos currently posts Stage 3 drought response, with current watering rules linked from the dashboard.
Water rebates
Rebates may be available for rainwater, soil-saver work and irrigation-zone conversion/removal.
Tool / rule |
Official detail |
How to use it |
|---|---|---|
Usage Threshold Program |
Customers can set daily, monthly or both daily/monthly water and electric thresholds in Customer Connect. |
Set a low daily threshold to catch toilet, irrigation and hose leaks earlier. |
Customer Water Usage Dashboard |
Dashboard shows daily/monthly water demand and source mix; data may take up to two business days to reflect current information. |
Compare your account use with community demand and drought conditions. |
Water sources |
Dashboard identifies Canyon Lake, Carrizo-Wilcox Aquifer and Edwards Aquifer as source categories. |
Drought and supply updates can explain conservation messaging. |
Stage 3 drought response |
City currently posts Stage 3 drought response and links current restrictions. |
Check the current schedule before running sprinklers. |
Sprinkler schedule |
City conservation page posts weekly sprinkler-use windows and no-sprinkler weeks. |
Do not rely on an old saved watering calendar. |
Rainwater harvesting rebate |
Open to qualifying SMTX Utility customers in good standing; pre-approval may be required. |
Read flyer/application before buying equipment. |
Soil Saver rebate |
For existing single-family residential SMTX Utility customers in good standing. |
Use for aeration, compost top-dressing and mulch practices that reduce water need. |
Irrigation conversion/removal rebate |
Open to existing residential and commercial SMTXU water customers in good standing; work must meet program rules. |
Keep removed components and use licensed irrigator/property-owner rules from application. |
Water Quality, Source Water, Reports and Emergency Checks
Water Quality Department
SMTX Utilities monitors drinking water and wastewater in distribution and collection lines under local, state and federal rules.
2025 Water Report
The City posts annual water-quality reports under TCEQ reporting requirements, with 2025 listed as the current report.
Water quality email
For water-quality questions, use drinkingwaterquality@sanmarcostx.gov or the emergency number for urgent issues.
Water-quality / system question |
Official detail |
Customer action |
|---|---|---|
Annual drinking-water report |
City posts annual water-quality reports, including the current 2025 Water Report. |
Use the current report before relying on old neighborhood claims. |
Water-quality question |
Water Quality page lists drinkingwaterquality@sanmarcostx.gov. |
Email for non-urgent drinking-water quality questions. |
No water, major leak or wastewater emergency |
Emergency number is 512-393-8300. |
Call immediately and give address/cross street. |
Water source context |
City dashboard lists Canyon Lake, Carrizo-Wilcox Aquifer and Edwards Aquifer source categories. |
Check drought dashboard and conservation page when source conditions change. |
Surface water treatment plant |
City facility listing says the Surface Water Treatment Plant is City-owned and GBRA-operated, with Canyon Lake as source. |
Use official water-quality pages for current treatment/report details. |
TTHM notice concern |
Water Quality page includes current and past reports plus public notices. |
Read the listed public notice and call/email Water Quality if your address is affected. |
Backflow / cross-connection |
City has a Backflow Prevention Program to protect potable water from customer-side contaminants. |
Ask whether your irrigation, commercial process or device needs testing/reporting. |
Industrial/commercial wastewater |
Industrial Pretreatment Program protects the collection system, treatment plant and San Marcos River. |
Commercial users should contact the pretreatment route if discharge rules apply. |
Map: San Marcos Utility Billing Office
Use this map for the Utility Billing office at 1040 Highway 123, San Marcos, TX 78666. This is the walk-in/drive-through customer-service location for utility payments, service start/stop help and disconnected-service questions.
Location / route |
Address / phone |
Best use |
|---|---|---|
Utility Billing Office |
1040 Highway 123, San Marcos, TX 78666 |
Walk-in/drive-through payment, start/stop service, deposit questions and disconnected-service help. |
Billing phone |
512-393-8383 option 3 |
Billing questions, Customer Connect help, arrangements and account support. |
Phone payment |
512-393-8333 or 512-393-8383 option 2 |
Automated payment for current accounts. |
Emergency |
512-393-8300 |
Electric or water/wastewater emergency. |
Mail payment |
636 E Hopkins, San Marcos, TX 78666 |
Mail check/money-order payment. |
Drop boxes |
630 E Hopkins and 1040 Highway 123 |
After-hours payment drop-off; no cash. |
H-E-B payment |
641 E Hopkins and 200 W Hopkins |
Western Union Convenience Pay with billing statement and $1 cash service fee. |
San Marcos Water Utility FAQ
What is the San Marcos utility billing phone number?
Call Utility Customer Services at 512-393-8383 and select option 3 for billing, account help, Customer Connect support, payment arrangements and start/stop service questions.
What is the San Marcos water emergency number?
Call 512-393-8300 for electric and water/wastewater emergencies, including urgent water leaks, no-water issues or wastewater problems.
Where do I pay my San Marcos utility bill online?
Use the official Customer Connect portal at connect.sanmarcostx.gov. You can make a one-time payment, register your account, enroll in AutoPay and set water or electric usage threshold alerts.
What do I need to register for Customer Connect?
You need your utility account number and mailing address ZIP code exactly as listed on the account. New customers will see the account number on the first bill.
Can I pay my San Marcos utility bill by phone?
Yes. The City lists automated telephone payment at 512-393-8333 for eCheck or Visa, MasterCard and Discover. Customer Connect instructions also route phone payment through 512-393-8383 option 2.
Where is the San Marcos Utility Billing office?
The Utility Billing office is at 1040 Highway 123, San Marcos, TX 78666. It is open Monday-Friday from 8 a.m. to 5 p.m., excluding holidays, and has a walk-in lobby and drive-through.
Can online payment restore disconnected San Marcos utilities?
No. If utilities are interrupted due to nonpayment, online payments and automated phone payments cannot be used to restore service. Contact Utility Customer Services at 512-393-8383 or visit 1040 Highway 123.
How do I start or stop San Marcos utilities?
Open, transfer or close service through Customer Connect, in person or by allowed written methods. New accounts and closes cannot be handled by telephone request alone, and disconnections are completed weekdays from 8 a.m. to 5 p.m., excluding holidays.
What changed on San Marcos utility bills in June 2026?
Starting in June 2026, the Community Benefit Charge is shown separately on bills for transparency. The City says this is not a new additional charge but an existing cost previously included in base utility rates.
Does San Marcos issue water leak adjustments?
Yes, but the account holder must submit the completed Water Leak Packet with supporting documents. Adjustments are not more than two months retroactive, adjusted bills do not exceed two, and review takes about 10-14 business days after complete submission.
30-Second San Marcos Water Utility Checklist
Pay/login: use Customer Connect at connect.sanmarcostx.gov; have account number and mailing ZIP code ready.
Billing phone: call 512-393-8383 option 3; phone payment is listed at 512-393-8333 or 512-393-8383 option 2.
Office: Utility Billing is at 1040 Highway 123, San Marcos, TX 78666, Monday-Friday, 8 a.m.-5 p.m.
Emergency: call 512-393-8300 for electric or water/wastewater emergencies.
Disconnection: online and automated phone payments cannot restore utilities interrupted for nonpayment; call or visit Utility Billing.
Rates: June 22, 2026 bills show water/wastewater components differently because Community Benefit items are separated for transparency.
High bill: check water gallons, sewer winter average, stormwater class, garbage cart, electric use, AutoPay decline, H-E-B next-business-day posting, leak packet and assistance options before disputing.

Editorial Team
WaterBillGuide.us
The content on WaterBillGuide.us is researched and prepared by our editorial team. Our writers and researchers review publicly available information from official utility websites and service portals to create clear, step-by-step informational guides.
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