Texas water scarcity is not an abstract concern. The state’s population is projected to grow by more than 40% by 2050, and available water supply is not growing with it. Against that backdrop, the Texas Commission on Environmental Quality (TCEQ) and local water districts have implemented increasingly stringent water conservation rules — rules that directly affect how commercial properties irrigate their landscapes.
Most commercial property managers know vaguely that water restrictions exist. Fewer understand specifically what’s required of their property, how compliance is measured, and what documentation is needed. This article breaks down the regulatory framework, what water audits are required to demonstrate, and how to approach compliance practically.
TCEQ's Role in Landscape Water Conservation
TCEQ is the state agency responsible for water quality and quantity regulation in Texas. For landscape irrigation, TCEQ’s primary role is establishing minimum standards for water conservation plans and setting the framework within which local water districts operate. TCEQ rules require all retail public water suppliers serving more than 3,300 connections — which includes virtually all municipal water utilities — to have a water conservation plan that meets minimum requirements.
Those conservation plans typically include landscape watering schedules and restrictions. The irrigation restrictions that most Texas property managers are familiar with — watering only on certain days, only before 10 a.m. or after 6 p.m. — are part of these conservation plans. Commercial properties with irrigation systems are subject to these restrictions, though enforcement varies significantly by district.
TCEQ also enforces rules around irrigation system design and installation. Licensed irrigators (LI designation) must oversee commercial irrigation system design and installation. All commercial irrigation systems must include a properly sized and installed backflow prevention device to protect the potable water supply. These requirements exist at the state level and are non-negotiable regardless of local water district rules.
Local Water District Rules: Where the Detail Lives
While TCEQ establishes the state framework, the specific rules that affect your property day-to-day typically come from your local water district or municipal water utility. Texas has thousands of Municipal Utility Districts (MUDs), Special Utility Districts (SUDs), and city utilities, each with its own conservation plan and restrictions. The variation between districts is significant.
Some districts require water audits for large commercial accounts as a condition of service or as part of conservation variance applications. Some require annual reports of landscape water use. Some have implemented tiered pricing that makes large-volume irrigation use significantly more expensive above certain monthly thresholds. Understanding your specific district’s rules is essential — the TCEQ framework tells you the floor, not the ceiling.
Contact your water district’s conservation department directly if you’re unclear on your property’s obligations. Most Texas water districts with active conservation programs have staff dedicated to helping large commercial accounts understand and meet requirements. They can tell you exactly what’s required of a property your size, whether water audits are mandatory or voluntary, and what the documentation process looks like for compliance.
What a Compliant Water Audit Includes
When a water district or conservation program requires a water audit, they typically mean a field-based efficiency evaluation that produces documented, measurable data — not a visual inspection or a controller programming review. A compliant water audit for a Texas commercial property generally includes catch-can distribution uniformity testing, precipitation rate measurement, and documentation of system operating conditions.
The ASABE (American Society of Agricultural and Biological Engineers) standard for landscape irrigation auditing (S398.1) defines the methodology for audits that will be submitted to regulatory bodies. Catch cans must be placed in accordance with specific grid patterns relative to head spacing. Run times must be standardized. Measurements must be recorded to prescribed precision. The resulting DU calculation must follow the defined formula.
A compliant audit report includes: the date and conditions of the test; documentation of the system being tested (head types, spacing, pressure); catch-can placement grid; individual can measurements; DU calculation with methodology shown; precipitation rate by zone; comparison of actual water use to ET-based benchmarks; and recommendations for improvement. This level of documentation is what water districts and TCEQ require when audits are submitted for compliance or variance purposes.
Water Budget Compliance
Many Texas water districts have moved toward water budget-based conservation programs for large commercial accounts. A water budget establishes how much water a property is expected to use based on its irrigated landscape area, plant types, local ET rates, and irrigation system efficiency. Accounts that consistently exceed their water budget face surcharges, required audits, or irrigation restrictions.
For a commercial property receiving a water budget notice from its district, a professional water audit is typically the first required step. The audit documents the property’s current system efficiency and provides a baseline for improvement recommendations. Properties that implement audit recommendations and achieve demonstrated improvement in efficiency often qualify for water budget adjustments that reflect the system’s actual optimized performance.
ET (evapotranspiration)-based scheduling is the central tool for water budget compliance. An ET-based schedule adjusts irrigation run times daily or weekly based on the actual water demand of the landscape, calculated from weather data (temperature, humidity, solar radiation, wind). A properly programmed smart controller can reduce irrigation water use by 20–40% compared to a fixed schedule, bringing many properties into budget compliance without hardware changes.
Documentation: What You Need to Keep
Whether your district requires it or not, maintaining documentation of your irrigation system’s efficiency and your conservation efforts is good practice. If you’re ever subject to an audit, penalty, or variance application, having records is essential.
Keep the following documents accessible: your most recent water audit report with DU measurements and recommendations; your controller’s current programming with scheduling rationale; water utility bills for the last 24 months; backflow preventer test certifications; any variance approvals or communications with your water district; and records of irrigation system repairs and improvements.
Annual water audits are best practice even if not required by your district. The audit establishes a current baseline, documents any system improvements, and provides data for controller scheduling optimization. For large commercial properties, an annual audit typically pays for itself in water savings identified through the process.
Conclusion
Texas water conservation regulations are real, consequential, and will become more stringent as the state’s water supply challenges intensify. Commercial properties that proactively audit their irrigation systems, document efficiency improvements, and maintain TCEQ-compliant records are better positioned for regulatory compliance and better protected against the water cost increases that conservation pricing tiers are bringing to large commercial users. The investment in professional water audits pays dividends both in compliance security and in operational savings.