Austin Requires New Development to Meet Watershed and Solar Standards

Austin's Environmental Code, Title 30 of the Austin City Code, requires watershed protection, tree preservation and erosion control measures for most new development, with green stormwater infrastructure as the primary method. On March 27, 2025, the Austin City Council approved an ordinance that strengthens erosion protections on the Colorado River downstream of Longhorn Dam. These rules set limits on impervious cover from 15 percent to 90 percent depending on watershed classification and establish Critical Water Quality Zones with construction setbacks of 50 to 700 feet on creeks draining at least 64 acres.

Standards for New Construction

All new residential and commercial buildings must be designed as solar ready. The city has set a goal of 75 percent greenhouse gas reduction by 2030 and net zero emissions by 2050. Under updated EPA standards that lowered the fine particulate matter limit to 9 micrograms per cubic meter, the Austin area is designated as having dangerously high air pollution levels that require reduction. These provisions apply directly to projects that residents may encounter when seeking new housing or commercial space.

The code provisions shape how new development proceeds near waterways and in different watershed areas. Construction in Critical Water Quality Zones must observe the specified setbacks, and impervious cover is restricted according to local watershed rules. Green stormwater infrastructure is required as the main approach for handling runoff in most cases, replacing other methods as the default.

Application to Local Projects

Residents considering new homes or additions will work with these standards during permitting. The March 27, 2025 ordinance adds specific erosion requirements along the Colorado River section below Longhorn Dam. Air quality designations under the EPA limit affect planning for projects that must address particulate matter. The solar ready mandate and greenhouse gas targets guide design choices for buildings that meet the 2030 and 2050 goals.

Future projects are expected to continue following the impervious cover limits and water quality setbacks already in place. The city applies the same framework to residential and commercial permits across classified watersheds. No additional timeline beyond the 2030 and 2050 targets is stated in the current code provisions.