A main breaks across town at four in the morning. By six the utility has issued a boil-water notice, posted it, pushed it to the app and sent it to every phone number on the alert list. You are not on the alert list, because nobody is on the alert list by default — you have to go and put yourself on it. So you brush your teeth, make coffee, and find out at lunchtime from a neighbour. The information existed for eight hours. It simply had no route to you.
Step one: get on the alert list, today
Almost every US water utility now runs some form of emergency notification, and almost all of them are opt-in. Ten minutes of setup, and you are no longer the last to know.
- Your water utility’s own alerts. Search for your provider’s name plus “alerts” or “notifications”. Most run a system where you register a phone number, an email and an address. Register all three. Text is the one that reaches you fastest.
- The county or city emergency system. Separate from the water utility, and it covers more — boil notices, evacuations, severe weather. Usually “[your county] emergency alerts”. This is the one most people assume they are already signed up for.
- Wireless Emergency Alerts on the phone. Already on by default for the serious categories, but open Settings and check that “Public Safety Messages” is switched on, because it is the one that gets turned off accidentally and it is the one that carries this.
- Your utility’s app or portal. Worth it mainly for the usage data: many now show daily consumption, and an unexplained jump is how you find a leak before it finds you.
Add a calendar note to verify once a year. Utilities change notification vendors, and lists do not always survive the move.
Step two: know what is actually in it
The alert tells you when something has gone wrong. The rest of the time, the question is what is in the water normally, and you can answer that without guessing.
- The Consumer Confidence Report. Every community water system in the US has to publish one each year, and it lists what was detected and at what level. Search your utility’s name plus “water quality report”. It is free, it is specific to your system, and it is the single best source on your own tap.
- Test strips, 15 to 25 dollars for a pack. Hardness, chlorine, lead, pH, nitrates. Crude, but they catch the big problems and they take two minutes.
- A TDS meter, around 15 dollars. Reads total dissolved solids. Useful as a baseline — note the normal number, and a sudden change means something changed upstream. It does not detect bacteria, and a low reading is not a safety certificate.
- A certified lab test, 30 to 100 dollars, if the house predates 1986 or the report shows lead anywhere in the system. This is the one case where the cheap options are not good enough.
Step three: a filter that matches the threat
Filters are rated against specific contaminants, and the rating is the whole product. Buying on brand rather than certification is how people end up with a filter that does nothing about their actual problem.
- NSF/ANSI 42: taste, odour, chlorine. The basic pitcher.
- NSF/ANSI 53: health effects — lead, cysts like giardia and cryptosporidium, some VOCs. This is the one worth paying for.
- NSF/ANSI 58: reverse osmosis. Removes almost everything, wastes water, slow.
- NSF/ANSI P231: microbiological purifier — bacteria, viruses, protozoa. The rating that matters for emergency use, and the one most household filters do not carry.
For a kit, a squeeze or gravity filter rated for bacteria and protozoa, 25 to 40 dollars, filters thousands of gallons and stores for years with no maintenance. Pair it with purification tablets, under 15 dollars, which handle viruses that most mechanical filters do not. Filter first for the sediment, then treat. One caveat: a ceramic or hollow-fibre filter is destroyed by freezing — the ice cracks the pores invisibly and it still looks fine. Do not store one in an unheated garage.
Step four: the stored fallback
Alerts and filters assume water is coming out of the tap. Sometimes it is not, and then you want a reserve.
One gallon per person per day, three days minimum. A family of four needs 12 gallons for three days, 56 for two weeks. Half of it is drinking, half is cooking and hygiene.
And water does not expire — the container does.
- Away from fuel and solvents. PET plastic is slightly permeable and slowly takes on whatever it is stored beside. A case that spent three years on a garage shelf next to gasoline no longer tastes like water. That is the garage soaking in.
- Off bare concrete. A sheet of plywood or a pallet is enough.
- In the dark. Sunlight through a window grows algae in a clear bottle within months.
- Commercial bottles: rotate every 2 years. Not because year three is dangerous, but because tying it to the clock change is the only version of this you will actually do.
- Tap water you bottled yourself: 6 months, and only in food-grade containers that held a beverage. Two-litre soda bottles, washed, are genuinely good. Milk jugs are the classic mistake — residual sugar and protein in the plastic feed bacteria, and the jug is designed to break down.
The free capacity most people forget: the water heater holds 40 to 50 gallons, and that is drinking water. Shut off the inlet first so nothing contaminated is drawn in, then drain from the valve at the bottom. Add the ice you keep in the freezer and most households are already close to a week.
When the notice comes
A rolling boil for one minute — three if you are above 6,500 feet. That kills bacteria, viruses and protozoa, which is everything biological. It does nothing for lead or chemicals, and boiling longer actually concentrates them.
No way to boil: unscented household bleach, 8 drops per gallon, stirred, then left 30 minutes. It should smell faintly of chlorine. Bleach loses strength after about a year, so the bottle under the sink from two summers ago is not the one to use.
During the notice, the tap is unsafe for brushing teeth, washing produce and making ice, not just for drinking — the ice maker is what catches people, because it keeps running quietly for days afterwards. Dump the bin.
