MUD 501 Update Regarding City of Houston Water Main Break

MUD 501 receives drinking water from MUD 500, in its capacity as Master District. The water source for MUD 500 is the West Harris County Regional Water Authority (“WHCRWA”), which obtains treated surface water from the City of Houston (“City”).

As you may be aware, in response to a 96” water main break in the City’s system around noon yesterday, the City issued a Boil Water Notice yesterday evening. Please be aware that the WHCRWA is not issuing or requiring systems receiving water from the WHCRWA, including MUD 501, to issue a Boil Water Notice.

According to correspondence from the WHCRWA operator, which is available here, the drinking water supplied to the WHCRWA, including the MUD 501 water supply, has not been affected by the City’s water main break and continues to remain in compliance with all state and federal requirements.

Notice of Water System Flushing

Flushing of the District’s water lines will be conducted beginning on Tuesday, May 28, 2019. The flushing may continue until Monday, June 3, 2019.

During these days, you may notice discoloring of the water due to mineral sediment that is being flushed out of the system. The sediment is made of naturally occurring minerals. This sediment can cause permanent staining of clothing and some porous surfaces.

Please check the water before washing clothes or filling your pool or spa.

This flushing is being conducted to perform routine maintenance of the District’s fire hydrants and water mains. We expect to complete the work in the timeframe mentioned above; however, discolored water may persist for a short time after the work is complete.

If you have questions about this or other issues related to your water or sewer service please call us at 832-467-1599 or visit our website at

Thank you for your patience while this important work is being performed.

West Harris County Regional Water Authority Notice of Fee Increase

Please see the attached Notice of Fee Increase from the West Harris County Regional Water Authority (the “Authority”), stating that the Authority has increased its mandated surface water fee from $3.10 per 1,000 gallons, to $3.35 per 1,000 gallons, effective January 1, 2019. This fee, reflected as a separate line item on your water bill, is paid to the Authority and is used to pay for capital and operation costs of its existing surface water delivery infrastructure and the capital costs of additional new surface water delivery infrastructure. The Authority delivers surface water to your district.

For more information about the Authority, please visit:

Coming Soon – New Online Customer Portal

On September 15, 2018, the new online customer portal will be available for making water bill payments. After this date, you can create an account by visiting and following the instructions below. Make individual or automatic payments online for a $1.00 fee, when paying by eCheck from a bank account or a 3% fee when paying by credit or debit card. If you made electronic payments in the past the previous website will redirect you to the new payment portal.

How to create an account:

  1. Go to
  2. Click on Pay Your Water Bill
  3. Click on link under Web Payments
  4. Click on Sign up now
  5. Follow online instructions beginning with your security code from your most recent water bill.

We hope you enjoy the new features which will include:

  • Viewing real-time balance & transaction history
  • Viewing current and past billing statements
  • Viewing your water use history
  • Updating your mailing address
  • Signing up for eBilling

Changes to Our Auto-Pay Program

We are moving our auto-pay program to the Online Customer Portal beginning September 15, 2018. This change will not disrupt auto-payments set up through our original payment program and no action is required.

After September 15, 2018, we encourage you to sign on to the new customer portal and confirm/update your account information. If no changes are made by customer auto-pay will continue as originally set up.

For more information or assistance with registration, call EDP at
Monday – Friday, 8:00 am to 5:00 pm CST.
Visit for more information.

Harris County MUD No. 500 Master District – Notice Regarding Water Supply

Harris County Municipal Utility District No. 500, as Master District, provides the potable water supply to the Towne Lake Master District Service Area, including Harris County Municipal Utility District No. 501. The Master District purchases the potable water it provides to the Master District Service Area from the West Harris County Regional Water Authority. The Master District has provided notice that, beginning today, the West Harris County Regional Water Authority will shut off its water supply to the Master District for 7 to 10 days. The water is being turned off due to an emergency water main repair that will be performed by the City of Houston.

The Master District maintains interconnects with nearby municipal utility districts to provide potable water during service outages. The Master District’s operator, Environmental Development Partners, contacted those municipal utility districts, and Remington Municipal Utility District has indicated they have sufficient water supply capacity to serve the Master District Service Area. They will be providing approximately 600,000 gallons per day of potable water to the Master District to serve the Service Area, including Harris County Municipal Utility District No. 501.

In advance of the West Harris County Regional Water Authority shutting off its water supply to the Master District, the Master District’s operator reported that they opened, flushed and tested the interconnect with Remington Municipal Utility District to ensure it is operational and will provide adequate water supply. The Master District’s operator reported that this work was completed, and the interconnect was opened yesterday at noon. The Master District’s operator also reported that, due to the advance notice of the impending shut off, they were able to “top-off” the storage tanks at the Master District’s water plant. According to the Master District’s operator, in the event there is a failure of water supply from Remington Municipal Utility District, the Master District’s water plant will provide adequate water for a temporary period of time (up to about 12 to 16 hours), allowing the operator to respond and take corrective actions.

During this time, the Master District’s operator does not expect any customers in the Master District Service Area to be affected by this change of water supply. However, it is possible that there could be some customers experiencing water discoloration or noticing a difference in the water pressure. Please report all water supply and service issues to the operator, Environmental Development Partners, at (832) 467-1599.

Harris County MUD 501 Water Is Safe to Drink

Contrary to reports on social media, the District’s operator, Environmental Development Partners, has confirmed that the Harris County MUD 501 water system is working properly and the water is safe to drink. If any issues arise with the water supply, the District plans to post the information on its website and send an email alert to those who have subscribed to the District’s email distribution list. To sign up for Harris County MUD 501 alerts, please click here.