Water & Power Shutoff — What to Do Before Week Two Ends
Every save runs on two hidden countdowns: the taps and the grid. On default Build 42 settings the water can die on day 0 and the grid holds at most 30 days. This page is the pre-shutoff checklist, in the order that saves lives.
Do not plan around a specific day. The defaults are ranges, not dates.
The two clocks
Build 42's server sandbox sets both shutoffs as ranges, rolled once per save. These are the default values from the Build 42 server sandbox file:
| System | Default window (Apocalypse) | What it means |
|---|---|---|
| Mains water | Days 0–30 | Could stop the moment you spawn. Never "too early" to store water |
| Power grid | Days 14–30 | Guaranteed at least two weeks — but that is the best case, not a promise |
| Alarm batteries | Days 0–30 after power dies | House alarms stop working after this, so looting alarms is a power-era activity |
The other standard presets move the same windows: Outbreak and Rising stretch both to 14 days – 2 months. If you play those, you get more breathing room, not immunity.
Water: fill, catch, boil
After shutoff, taps dispense nothing. Everything you drink from then on comes from what you stored, what you caught, and what you purified. Three phases:
| Phase | What to do | Notes |
|---|---|---|
| Before shutoff | Fill every container: pots, buckets, bowls, bottles, mugs | Unlimited, free, safe. This is the single highest-value hour in the whole early game |
| After shutoff | Rain collectors sit outside and fill when it rains; rivers, ponds and creeks are endless but dirty | Uncleaned water makes you sick — boil it on a fire or purify it before drinking |
| Long term | Plumb a rain collector into a sink with a pipe and wrench | Plumbed fixtures dispense clean water to the base without walking outside |
Power: the generator maths
After the grid dies, a generator is the only source of electricity. The relevant defaults from the Build 42 sandbox:
| Setting | Default | What it means |
|---|---|---|
| Generator spawning | Rare | Finding one is a real event — guard it, note where you saw it even if you cannot take it yet |
| Fuel consumption | 0.1 per in-game hour | A full tank runs quietly for days; hauling fuel is the real cost |
| Power range | 20 tiles horizontally, 3 levels vertically | One generator can power a whole compound — place it centrally |
| Exterior placement | Allowed | An exterior generator can power a fuel pump. That is how you keep the fuel runs short |
Priority order once power is scarce: fridges and freezers first, lights second, everything else never. Build 42 fridges warm gradually on the day power dies rather than spoiling instantly, which buys you a little slack — but fresh meat is still a "eat it or lose it" item the moment the grid is gone.
Food: the fridge countdown
Power shutoff is really a fresh-food deadline. On the day the grid dies, every fridge in the map starts a slow clock. Two moves:
- Eat the fridge first. Fresh meat, produce and meals are a "now" resource the moment you know power is ending. Cook it, or lose it.
- Switch the pantry to long-life. Canned goods, dry food and preserved items carry you from week three onward. Grab a can opener on day 1 — it is the most-missed item in the game.
Farming closes the loop but starts paying off weeks later, which is exactly why the seeds run belongs to day 6, not day 30. Crops planted after shutoff are food for month two, not month one.
The first 48 hours, in order
- Day 1, morning: secure a lockable base. Fill every container you own with tap water before anything else.
- Day 1, while power lasts: watch Life and Living TV — it broadcasts at 6 AM, 12 PM and 6 PM and grants fast skill XP in carpentry, cooking and more. This bonus ends at shutoff too.
- Day 1–2: loot the nearest houses for long-life food, a can opener, and a melee weapon worth keeping.
- Day 2–3: eat fresh food from fridges deliberately; store the rest. Note every place you saw a generator for sale or parked.
- Day 3–7: medical supplies — bandages, disinfectant, painkillers. Weeks two and three are when the mistakes happen, not week one.
- Before day 14: have a plan for the grid dying: where the generator is, where the fuel is, and what the fridge handover looks like.
What Build 42 changed
- The preset menu is new. Apocalypse, Outbreak, Rising and Extinction replaced the old Apocalypse / Survivor / Builder lineup. Outbreak and Rising get longer utility windows (14 days – 2 months); Apocalypse keeps water 0–30 and power 14–30.
- Fridges now warm gradually on shutoff day instead of spoiling everything instantly.
- Alarm batteries decay on their own timer (0–30 days after power) — alarms are a power-era resource.
- Core mechanics — rain collectors, boiling, generators, plumbing — carry over from Build 41 with the same defaults.
FAQ
When exactly does water stop in Project Zomboid Build 42?
On default Apocalypse settings, somewhere in days 0–30 — it is rolled once per save, not fixed. Outbreak and Rising stretch the window to 14 days – 2 months. You cannot know your save's exact day in advance, which is why water storage is a day-1 job.
When does the power go out?
Default Apocalypse is days 14–30. Power always outlasts water's worst case: even if your water died on day 0, the grid holds at least two weeks. Use those two weeks to prep.
Do I have to boil rain water?
Water collected in rain collectors and taken from rivers or ponds is uncleaned and can make you sick. Boil it on a fire or use another purification step. Tap water before shutoff is safe.
How long does a tank of generator fuel last?
A generator burns 0.1 fuel per in-game hour on default settings, so the tank itself is not the problem — hauling fuel is. Place the generator within 20 tiles of what matters, and an exterior generator can power a fuel pump to shorten the supply run.
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Sources & verification
Shutoff ranges, generator values and preset windows are taken from the Build 42 server sandbox defaults (WaterShut 0–30 days, ElecShut 14–30 days, GeneratorFuelConsumption 0.1/h, GeneratorTileRange 20) as documented for 42.19–42.21, cross-checked against community references in November 2026. Preset names reflect the current 42.19+ menu. Life and Living broadcast times are long-standing mechanics carried into B42. If your sandbox settings differ, all numbers on this page change with them.