Venomous Western Cottonmouth snakes have been spotted near parks, trails and detention ponds in Spring, prompting a safety advisory from Harris County Municipal Utility District No. 71.
The district published the advisory on Wednesday, Sept. 16, identifying the Western Cottonmouth, also called the Water Moccasin, as the venomous species of greatest concern near local water features. The semi-aquatic pit viper is native to Texas and commonly found near lakes, creeks, drainage ditches and other slow-moving water.
Adult Cottonmouths range from 20 to 48 inches long. They are dark, nearly black, with a thick triangular head and a short, stubby tail. When threatened, the snake coils its body, lifts its head and opens its mouth wide to reveal the bright white interior that gives it its name.
When and where to watch out
Snakes are most active between April and October, with peak activity in the hotter summer months, according to the advisory. They become less active below 50°F and above 90°F. Residents are most likely to encounter one near shaded brush, tall grass, or warm concrete paths and sidewalks during early morning or late evening hours.
Most snake bites in the United States happen when someone tries to kill, handle or move a snake, the district said. Leave all snakes alone.
Precautions for residents
The advisory lists four steps residents should take:
- Avoid walking through tall grass or brush.
- Watch where you step near rocks, culverts or shoreline vegetation.
- Keep pets leashed and away from the water's edge or wooded areas.
- Teach children not to touch or approach any wild animal, including snakes.
What to do if bitten
The district said any suspected venomous snakebite should be treated as an emergency. Residents should call 911 or the Texas Poison Center Network at (800) 222-1222 for guidance, including information about nearby facilities that carry antivenom. The helpline is available 24 hours a day, seven days a week.
Texas Poison Centers handled 1,081 snakebite cases statewide in 2025, according to the Texas Poison Center Network.
Several non-venomous species also live in the area, including the Texas Rat Snake, Rough Green Snake and Diamondback Water Snake. The district described those species as generally harmless and likely to avoid human contact when left undisturbed.
Who to call about a snake sighting
For snakes in district-maintained parks or common areas, residents can call Regional Water Corporation, the district's operator, at (281) 897-9100. Homeowners who find a snake on private property may contact a licensed wildlife removal professional.
