When the advisory is serious. Storage and treatment that carry you through a longer outage of safe water.

Concrete moves that lower your Vulnerability. Add any of them and we'll track it as an action on your threat list.
Reality-CheckMost filters remove what you can see and the bugs that cause the classic backcountry illness — but not viruses. Knowing which job each method does is what keeps you from getting sick on 'clean' water.
PrimerA precautionary advisory is noise. Real contamination — germs or chemicals — needs stored water and the right treatment, because boiling only solves half the problem.
Your water sources, against what discharges near them.
A national view — this is one of 410+ layers in Area Recon. Open it to zoom to your address, then add the hazards, infrastructure, terrain and resources around you, and read the real numbers for your county.
Explore in Area Recon →Add it to your personal threat list, score it for your own household, or pull the real hazard data for your county.