Background

The Highway 30 Landfill, located at 1351 S. Gun Club Road/State Highway 30, is a closed landfill formerly operated and currently owned by the city of Aurora. The site operated as a municipal solid waste landfill from 1969 until the landfill closed in 1975.

The city of Aurora has conducted post-closure monitoring of groundwater at the site since closure of the landfill in 1975. Environmental investigations from 2016 through 2024 detected contaminants in groundwater downgradient from the site at levels above state groundwater quality standards.

The Hazardous Materials and Waste Management Division of the Colorado Department of Public Health and Environment issued a Final Compliance Order on consent to the city of Aurora, effective on Oct. 1, 2019, to address the groundwater contamination.

Assessment of Corrective Measures Report

The Assessment of Corrective Measures Report analyzes the effectiveness of potential solutions to address groundwater contamination. The city of Aurora and the Colorado Department of Public Health and Environment received comments from the public in late 2025 on corrective measures to address groundwater contamination presented in the Assessment of Corrective Measures Report.

Visit this link to access and review the Assessment of Corrective Measures Report in a PDF format (including portions in Spanish).

For questions on the report, contact:
Taylor Pierce, Professional Engineer I
CDPHE/HMWMD
4300 Cherry Creek Drive South
Denver, CO 80246
[email protected]
303.692.3394

Remediation Work

The city's Energy and Environment Division received grant funds from the state of Colorado to support ongoing groundwater testing and design work related to remediation efforts.

Remediation efforts, which began in June 2026, will regrade the soil over the waste trenches to redirect stormwater flow and then perform other measures to reduce the contamination.

Frequently Asked Questions