Customers

5300 Coral Gables Dr.
Houston, TX 77069

In Case of Water/Sewer Emergency,
Si Environmental: (281) 807-9500

Regular Meetings
Recreation Facilities Meetings
Rules and Regulations
Pool Schedule

Dear Valued Customer,

We are pleased to inform you that our software system upgrade is nearly complete. As part of this transition, your water invoice, starting with the November 2025 statement, will feature a new look and new account number.

After you receive the new invoice statement, you will be able to view your Billing History, Payment History and Pay Your Bill using your credit card (Visa, MasterCard, Discover or American Express) or electronic check. We provide an online experience that is secure and convenient. More details about these new payment options as well as others are enclosed. We invite you to visit our website at www.sienviro.com.

*Please note: Due to the system upgrade, electronic payments will be unavailable for your October 2025 bill due 11/20/2025. During the transition, your available payment options will be:

Option 1: A check or money order made payable to your district brought to one of our offices or mailed to PO BOX 4824 HOUSTON, TX 77210-4824. Please make sure to include the service address or old account number on the check. Option 2: Pay after the upgrade-no late fees. You may wait to pay after the system upgrade, when you receive your November 2025 statement, using your new account number. You’ll be able to pay both October and November bills together. No late fees will apply for the 11/20/25 due bill.

Our goal is to make this transition as smooth as possible and to continue delivering the high level of service you expect from Si Environmental. Enclosed, you will find the Payment Options offered through the new online system along with our regular payment options through local stores, bill pay, mail, and our office drop-off locations, and a guide for How to Read Your New Bill.

If you have any questions or concerns regarding the new invoice format or your account, please don’t hesitate to reach out to our Customer Care team:

Phone: 281-807-9500

Email: cyp.customerservice@sienviro.com

Thank you for being a valued customer.

Sincerely, Si Environmental, LLC.

Payment Options

Pay-By-Phone (go to www.sienviro.com, find your district, the number is listed there)

  • Visa/MasterCard/Discover/American Express (3% Convenience Fee*)
    • Posts next business day
  • Electronic Check ($1.00 transaction fee*)
    • Posts to account next business day

Online Website (go to www.sienviro.com, find your district, click Pay Online)

  • Visa/MasterCard/Discover/American Express (3% Convenience Fee*)
    • Posts next business day
  • Electronic Check ($1.00 transaction fee*)
    • Posts to account next business day

Text to Pay (go to www.sienviro.com, find your district, login online to set up payment via your mobile device)

  • Visa/MasterCard/Discover/American Express (3% Convenience Fee*)
    • Posts next business day
  • Electronic Check ($1.00 transaction fee*)
    • Posts to account next business day

Monthly Auto-Draft (go to www.sienviro.com, find your district, login online to set up Auto-Draft)

  • Visa/MasterCard/Discover/American Express (3% Convenience Fee*)
    • Posts to account on the scheduled draft date
  • Electronic Check ($1.00 transaction fee*)
    • Posts to account on the scheduled draft date
      • Please note: customers who opt to sign up for e-billing and auto draft payments paid via electronic check will have the $1.00 transaction fee waived.

All Walmart Locations (Check-Free)

  • Visa/MasterCard/Discover/American Express (3% Convenience Fee*)
    • Posts next business day
  • Electronic Check ($1.00 transaction fee*)
    • Posts to account next business day

Western Union (QuickPay – various HEB, Kroger and Fiesta stores)

  • $1.50 Transaction Fee*
    • Posts to account within (2-3) business days

Online Bill-Pay (through your banking institution)

  • Please be sure to include your complete 15-digit account number when setting up Online Bill-Pay through your banking institution (ex: 90XXX-XXXXXXXXXX).
  • Please be advised that Online Bill-Pay through your banking institution generally involves your bank utilizing a third-party company to create a paper check that is sent to the specified remittance address. Your Municipal Utility District nor Si Environmental, LLC. will have any control over the check creation and the mailing process for this banking institution service.
    • Remittance address: HC WCID #116 – PO BOX 4824, Houston, TX 77210-4824
    • All payments received are processed within 1 business day of receipt by Si Environmental, LLC.

MUD Lockbox (Checks sent via the United States Postal Service)

  • Mailing address: HC WCID #116 – PO BOX 4824, Houston, TX 77210-4824
    • All check or money order payments should be made payable to your district: HC WCID #116.
    • All payments received are processed within 1 business day of receipt by Si Environmental, LLC.

Operator’s Drop Box Locations:

  • 6420 Reading Road, Rosenberg, TX 77471
  • 5300 Coral Gables Dr, Houston, TX 77069
  • 9431 Rio Grande Dr, Houston, TX 77064
  • 9826 Whithorn Dr, Houston, TX 77095
    • NO CASH ACCEPTED (Personal Checks, Cashier’s Checks, and Money Orders only)
      • All check or money order payments should be made payable to your district: HC WCID #116.
      • All payments received are processed within 1 business day of receipt by Si Environmental, LLC.

How to Read Your Bill

Frequently Asked Questions

Si Environmental, LLC Customer Service Department Information:

Main: 832-490-1600
Fax: 832-490-1501

Website: www.sienv.com
Email: customercare@sienv.com

Customer Service hours of Operation: Monday – Friday 8:00 AM – 5:00 PM CT

Direct all correspondence to:
PO BOX 4824
HOUSTON TX 77210

Answer: Register your account to view your bill online or sign up for e-billing.

Answer: You can register your account to make payments or skip the registration to pay as a guest. Once you have successfully logged in, please choose the “Make Payment” option on your Home page. You have the following payment options online:

  • Credit Card (Visa, MasterCard, Discover, Amex)
  • Debit Card (Visa, MasterCard, Discover, Amex)
  • E-Check

Answer: The below payment options are also available.

  • Save multiple payment methods for quick and easy processing using the “Account Settings” tab.
  • Schedule Auto Payments using the “Auto-Pay” tab.
  • Register online for Text and Pay. Get reminders about your due date and pay your bill with one easy text!

By phone: You can make a payment over the phone during regular business hours by contacting a live First Billing Services Customer Service Representative at (855)270-3592. The First Billing Services office is open Monday – Friday from 8:00AM – 4:30PM CT.

You can also contact the 24 hour automated phone bill payment system. The phone number for your district is located on your bill.

By Mail: Send payment to the secure payment processing center using the envelope and payment stub included with your bill. If you do not have a payment stub, please make sure your full account number is listed on your check or on your money order and send your payment to:

PO BOX 4824
HOUSTON TX 77210

In Person/ Drop Box:  Drop off your payment using our 24 hour drop box at the address below:

6420 Reading Road
Rosenberg, TX 77471

Answer: To create a new account, you will need to enter the following information:

  • Account Number
  • Zip Code of Billing Address

Answer: Please click on the “Forgot your User Name?” link on the Secure Client Log In screen. Enter your email address and click “Retrieve User Name” to retrieve your user name via email.

Answer: Please click on the “Forgot your Password?” link on the Secure Client Log In screen. Enter your user name and click “Reset Password” to receive a temporary password via email.

Answer: To view a copy of the previous payments processed by First Billing Services, choose the “Account History” option on your home page. You can email or print receipts from this location.

Answer: Register one of your accounts using the “Register” tab from the Secure Client Log in screen. Click on “Manage Accounts” to add additional accounts to your username. Once the additional accounts are registered, navigate the accounts using the quick drop menu on the top right side of your screen.

Answer: Click on “Manage Accounts” to remove an account from your username. Simply click on the delete button of any accounts you wish to remove.

NHCRWA Rate Decrease

The North Harris County Regional Water Authority (NHCRWA) will have a rate decrease effective October 1, 2024. The Regional Water Authority Fee on your water bill is a passthrough fee imposed by the NHCRWA on all water pumped from wells within its jurisdiction. The rate for Surface water will decrease to $3.05 per 1,000 gallons. Visit www.nhcrwa.org for more information.

Smart Meter Usage

As part of the District’s ongoing efforts to improve services to its customers, you now have direct and secure access to your water usage data. HC WCID 116 EyeOnWater suite of available tools includes a secure online website to review and analyze your usage patterns. A consumer smartphone app is also available, and can be downlaoded from the app store.

With these tools, you are now able to view your hourly usage activity and gain greater understanding and control of the amount of water you use. EyeOnWater Online provides easy to understand graphs and the ability to establish alerts–including identifying potential tasks.

To access your personalized online portal, please visit: www.eyeonwater.net/signup. To register for an online account, you will need: Zip code; your billing account number from your water bill, and your e-mail address.