The Hazardous Materials and Environmental Services Unit enforces portions of the following regulatory codes:
- Milpitas Municipal Code, Title V-Chapter 300
- California Aboveground Storage Tank Regulations (California Health and Safety Code, Chapter 6.67)
- California Underground Storage Tank Regulations (California Health and Safety Code, Chapter 6.7)
- California Business Plan and Inventory Reporting Regulations (California Health and Safety Code, Chapter 6.95)