Harris County, TX Landscaping Rules: Rainwater Harvesting (2026)
Key Facts
- Residential rule
- No mandate for homeowners
- Governing criteria
- Subchapter 36D, LID design criteria
- Adopted
- April 19, 2011
- Applies to
- Developers using cisterns for detention credit
- Enforcing agencies
- HCPID-AED and HCFCD
Summary
Harris County doesn't require homeowners to install rainwater harvesting systems, but developers who use cisterns or rain barrels to meet stormwater detention requirements must follow the county's Low Impact Development design criteria, including a water budget analysis.
Cisterns and rain barrels are designed to capture roof runoff for reuse. Cisterns reduce the runoff volume and may reduce the peak flow rate for small, frequently occurring storms. ... Development of a water budget should be conducted for maximum efficiency and is required to demonstrate how rainwater harvesting is used to reduce the storm water detention requirement.
Full Breakdown
Harris County's Low Impact Development and Green Infrastructure Design Criteria (Subchapter 36D, adopted April 19, 2011) treat rainwater harvesting as a voluntary storm water management practice, not a mandate for residential landscaping. Developers who choose cisterns or rain barrels to satisfy Harris County Public Infrastructure Department (HCPID-AED) or Harris County Flood Control District (HCFCD) detention requirements must show the storage tank's capacity stays available for the next storm and complete a water budget demonstrating how the system reduces the required storm water detention volume. The county assumes no maintenance responsibility for any LID system it approves.
Violations & Fines
Not a residential mandate, so there's no fine for skipping rainwater harvesting. Developers relying on it for detention credit without meeting the water budget and storage criteria risk plan rejection and loss of the detention credit.
Frequently Asked Questions
Do I need a permit to install a rain barrel in unincorporated Harris County?
Can a developer use rainwater harvesting to reduce a detention pond's size?
Sources & Official References
Other rules in Harris County
Texas rules heatmap·Compare Harris County to another location·View the Texas landscaping rules overview
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