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Internal District

For questions about a utility bill you received from Harris County MUD 500, or if you would like more information regarding the internal facilities and services that Harris County MUD 500 provides to residents and customers within its boundaries.

Master District

For resident or customer of the Master District Service Area, comprised of Harris County Municipal Utility District Nos. 500, 501, 502, and 503, and would like more information regarding the facilities and services that the Master District provides within the Master District Service Area.

Upcoming Meetings

Harris County Municipal Utility District No. 500 generally holds its regular Board meetings on the first Wednesday of each month, at noon, at:

Lakehouse at Towne Lake
10000 Towne Lake Parkway
Cypress, Texas 77433

The next regular meeting is scheduled for June 3, 2020. The agenda will be posted once it becomes available.

The National Weather Service has issued a Tropical Storm warning for Harris County and the surrounding counties in the Houston metropolitan area, as Tropical Storm Beta continues to approach the Texas coast. Over the next several days, the Houston metropolitan area may receive significant amounts of rainfall which could result in localized flooding. There also is a risk of wind and other damage from the storm.

MUD 500’s (the District) water and sewer system operator, Environmental Development Partners (EDP), is implementing its emergency preparedness procedures, as necessary, and will continue to monitor the progress of the storm and adjust its procedures accordingly. Please contact EDP at (832) 467-1599 at any time to report issues with District facilities.

Additional information and updates about the storm are available through the following:

The District encourages you to review your emergency preparedness plan and to continue to frequently monitor information about the storm as it develops.  The District will also be providing storm related updates as appropriate on its website and through email alerts.

The District also encourages residents to secure all outdoor patio and other items, including loose dock items and watercraft.  Please be advised that significant weather events may result in displaced wildlife, including alligators.  The District encourages residents to report all alligator sightings to EDP, at (832) 467-1599.

Latest News

Feb 22, 2021

Boil Water Notice Rescinded

Harris County Municipal Utility District No. 500, as Master District, supplies potable water to its Service Area, including Harris County MUD Nos. 500, 501, 502, and 503.  On February 17, 2021, the Texas Commission on Environmental Quality required the Harris County MUD No. 500 public water system, PWS ID TX1013390, to issue a Boil Water Notice to inform customers, individuals, or employees that due to conditions which occurred recently in the public water system, the water from this public water system was required to be boiled prior to use for drinking water or human consumption purposes.

The public water system has taken the necessary corrective actions to restore the quality of the water distributed by this public water system used for drinking water or human consumption purposes and has provided TCEQ with laboratory test results that indicate that the water no longer requires boiling prior to use as of February 22, 2021.

If you have questions concerning this matter, you may contact the District’s operator, Environmental Development Partners at 832-467-1599 or toll free at 1-866-467-1599.

Please click here for a copy of the Harris County MUD 500 notice.

Please click here for a copy of the Harris County MUD 501 notice.

Please click here for a copy of the Harris County MUD 502 notice.

Feb 22, 2021

Water Supply Update

The Harris County MUD 500 Master District Service Area, including Harris County MUD Nos. 500, 501, 502, and 503, remain under a boil water advisory at this time. As you may have heard, the City of Houston has lifted its boil water advisory. The City supplies potable water to the West Harris County Regional Water Authority (Authority), which in turn supplies water to the Master District. The Authority and the Master District now are taking the steps necessary to lift their respective boil water advisories, including water sampling. If the results are satisfactory, the Authority and the Master District may be able to lift their boil water advisories this evening or tomorrow, February 23rd. We will provide updated information as soon as it is available.

Feb 19, 2021

Water Supply Update

Harris County MUD 500, as Master District, heard from the West Harris County Regional Water Authority (Authority) this morning that the Authority is beginning to receive surface water from the City of Houston and expect to begin delivery sometime later today. The Towne Lake Community, including Harris County MUD 500, as Master District (which supplies water to HC MUD Nos. 500, 501, 502, and 503), and Harris County MUD 172 are at the top of the priority list to start receiving surface water as soon as it’s available. As you may have seen on the news, the City of Houston, which provides the surface water to the Authority, currently remains on a boil water advisory, and the Master District likely will need to remain on a boil water advisory until approximately 24 hours after the City lifts its advisory. Currently, the City is estimating that its advisory will be lifted on Monday. If that occurs, the Master District may be able to lift the boil water advisory on Tuesday. We will provide additional information as it becomes available.

Feb 17, 2021

Boil Water Notice for Community Public Water Systems

Harris County Municipal Utility District No. 500, as Master District, provides the potable (drinking) water supply to the Towne Lake Master District Service Area, including Harris County Municipal Utility District Nos. 500, 501 and, 502. Due to reduced system pressure, the Texas Commission on Environmental Quality has required the Master District’s public water system to notify all customers to boil their water prior to consumption (e.g., washing hands/face, brushing teeth, drinking, etc). Children, seniors, and persons with weakened immune systems are particularly vulnerable to harmful bacteria, and all customers should follow these directions).


To ensure destruction of all harmful bacteria and other microbes, water for drinking, cooking, and ice making should be boiled and cooled prior to use for drinking water or human consumption purposes. The water should be brought to a vigorous rolling boil and then boiled for two minutes.

In lieu of boiling, individuals may purchase bottled water or obtain water from some other suitable source for drinking water or human consumption purposes.


When it is no longer necessary to boil the water, the public water system officials will notify customers that the water is safe for drinking water or human consumption purposes.


Once the boil water notice is no longer in effect, the public water system will issue a notice to customers that rescinds the boil water notice in a manner similar to this notice.


Please share this information with all the other people who drink this water, especially those who may not have received this notice directly (for example, people in apartments, nursing homes, schools, and businesses). You can do this by posting this notice in a public place or distributing copies by hand or mail.


The Master District respectfully requests that customers conserve water by reducing all unnecessary water usage, including dripping of faucets, and isolate and shut off any leaking pipes promptly.


If you have questions concerning this matter, you may contact the Master District’s operator, Environmental Development Partners, at 832-467-1599 or [email protected]. This problem was caused by the unprecedented winter storm. Once conditions return to normal, we will post the appropriate notice.

Useful Links

CenterPoint Energy – report a streetlight outage

Harris County Sheriff’s Office – In the event of an emergency, please dial 9-1-1

For non-emergency law enforcement matters, please contact the non-emergency line at 713-221-6000

West Harris County Regional Water Authority

To report a suspected Storm Water Pollution Prevention Plan (SWPPP) violation, please contact the Harris County Pollution Control Services Department at 713-920-2831

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