Montgomery County, SJRA, and TPWD launched an investigation after discovering a large number of dead fish floating around Lake Conroe last week. No confirmed cause has been released, but sampling and agency coordination are underway.
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Last Wednesday, local officials reported the discovery of numerous dead fish at various locations along Lake Conroe. This alarming situation has prompted a coordinated response involving the San Jacinto River Authority, the Texas Parks & Wildlife Department, and local law enforcement.
Montgomery County’s Pct. 1 Constable’s Office took to Facebook to inform the community, stating, “We have received reports of a large number of dead fish appearing around Lake Conroe.”
Authorities in Montgomery County initially reported the massive fish die-off through a social media post. “Reports indicate a significant number of dead fish have been spotted around Lake Conroe,” stated the Pct. 1 Constable’s Office, highlighting that the San Jacinto River Authority (SJRA) and TPWD are closely observing the situation.
A representative for SJRA has verified that the agency has gathered water and biological samples from impacted areas “to evaluate potential causes,” noting that the Lake Conroe team is “working late into the night” to examine the results. The Texas Commission on Environmental Quality (TCEQ) has received formal notification and could become involved as investigations progress.
Authorities are still investigating the cause of the mass die-off. The official announcement provided no apparent signs of a chemical spill, illness, oxygen shortage, or any other potential causes. In previous incidents, organizations frequently investigated low levels of dissolved oxygen, harmful algal blooms, or outbreaks of pathogens as possible causes.
Lake Conroe is situated on the West Fork of the San Jacinto River, covering approximately 21,000 acres across Montgomery and Walker counties. SJRA manages the water control and reservoir operations of the lake.
Residents and boaters have expressed concerns about the accumulation of fish carcasses along the shorelines and near public boat ramps. A social media user suggested that “oxygen levels” might play a role, but there has been no official confirmation of that theory.
Currently, there are no alerts regarding the use of recreational water or the consumption of fish. Officials have announced that they will inform the community if any risks of contamination or health concerns arise.
Residents are encouraged to report any additional sightings to the Montgomery County constable’s marine division, working in collaboration with SJRA to ensure public safety on Lake Conroe.
This situation is developing rapidly. Stay tuned for further updates and the release of test results and evaluations.

The most recent U-Haul Growth Index shows that Conroe will be the fastest-growing neighborhood in the Houston area in 2025. Ranking No. 20 among U.S. towns, the Montgomery County seat shows many people moving there because they like the quality of life there. This is part of a larger trend of migration that is causing Texas's population to grow quickly. 20 among cities in the U.S. This shows that people are moving there in large numbers because of the quality of life and wider movement trends that are causing Texas's population to grow.
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