Find information on how to protect your property from flooding, what is a floodplain, building around a floodplain, national flood insurance program, the community rating system, and dam safety.

Find out what the storm drainage system is, where to see the public system, who maintains the drainage system, who maintains the easement, where to call to report a problem or get more information, what you can do to help.

What is a watershed?

Find Your Watershed

Watershed Management Plans

Improvement Projects and Restorations

Building - Bids, Solicitations, Construction

Storm Drainage Easements

Private Facility Maintenance

Floodplains and RPAs

Connecting to the Public System

Public Design Standards

Go Green with Hands On Conservation

You Can Help Prevent Pollution

Invasive Species | Trapa bispinosa

Stormwater Infrastructure Map

Maintenance

Inspections

Business Inspections| Polluted Runoff| Private Stormwater Facilities | Contractors

Facility Fact Sheets | FAQs

Stream Physical Assessments

Stream Quality Assessment

Stream Critters | Fish | Bacteria and Nutrients | Habitat

Municipal Separate Storm Sewer System (MS4) Permit

Polluted Runoff | Litter

Business Inspections

What's that Stuff in the Stream?

You Can Help Prevent Pollution

What is a watershed?

Educational Programs K-12

Fishes of Fairfax County| A Field Guide to Fairfax County's Plants and Wildlife | Water's Journey

You Can Help Prevent Pollution