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What in your home could affect your health, and how we keep you ahead of it.

Stasis checks your water, air and light against the health research, tests what matters, and keeps watch every day so you know what to do about it.

See how it worksSee how the tap test works
A sunlit kitchen opening onto a living room, with a glass of water on the stone counter beside the tap and a garden through the steel windows.

What we believe

  • Your health sets the bar, not the legal minimum.

    Legal limits weigh health against cost and what a treatment plant can manage. We grade your home against the level the research supports, and show the legal number next to it.

    Zero

    the health goal for lead. The legal action level is 15 parts per billion.

    See how we judge your water

  • You should never have to take our word for it.

    Every claim on our science pages links to the study or agency it came from, so you can check it yourself.

    350+

    published studies in our science library

    Browse the science library

  • Every home is unique.

    Two houses on the same street can need different things. The age of your pipes, the road out front and who lives with you change what matters most. So your plan is built for your home, not from one-size-fits-all advice.

    Your home, your people

    weighed into every plan

    See how your plan is built

How we work out what your home needs

We check where each reading came from, how recent it is and what it means for health. Your home and household details decide what needs attention first.

Every source is matched to your address, anywhere in the US, checked and compared with the research, then weighed for your home and the people in it.

What we gather

Water

  • Public water records44,657 water systems, 1.97 million test results
  • Your tap testOver a hundred substances, tested by an independent certified lab

Air

  • Nearby air monitorsClose to 7,000, read every hour
  • Satellite smoke mapsUpdated every 3 hours
  • Smog and pollen forecasts5 days ahead

Light

  • The sun at your addressSunrise, sunset and twilight, computed every day of the year
  • Sky and UV forecastCloud, sunlight and UV, hour by hour, five days ahead

Your home and household

  • Your homeYear built and likely pipes, the nearest major road, how dry or damp the air runs
  • Who lives thereChildren, pregnancy, older adults, asthma or allergies

How we check it

  1. Match to your homeYour address to your water system, the monitors nearest you and the sun overhead
  2. Check the readingsOld readings, faulty sensors and results that disagree with nearby monitors are set aside
  3. Compare with the researchBoth how much and for how long, against the levels that matter for health
Published research and health guidance350+ studies
  1. Weigh it for your homeOld pipes, a busy road, dry air or a sensitive household move what they affect up the list
  2. Choose the next actionRanked by what does the most for your health

What you get

  • Your Stasis ScoreWater, air and light, measured against the health research, not the legal minimum
  • Your planWhat matters most for your householdFixes matched to your homeFree changes first
  • Your alertsSmoke, smog and strong UV before they arrive, and when it's clear to open up
Where these numbers come from
44,657 water systems
Public water systems whose supply areas we have mapped, in every state. As of October 13, 2026.
1.97 million test results
Results water systems reported for their own water, including tests that found nothing, across 41,465 systems. As of October 13, 2026.
Close to 7,000 air monitors
6,797 air monitors in our database, 3,260 of them the same grade government agencies use. As of October 13, 2026.
350+ studies
Separate published studies our science library cites. Counted November 2, 2026.

We read what your water system reports. Then we test your actual tap.

Your water system's reports cover the supply. Your tap test shows what reaches your glass after the water runs through your pipes. An independent certified lab checks over a hundred substances, and your results update your score and plan.

  • Lower IQ in children: Lead from old pipes and fixtures. No amount is known to be safe for a child.
  • Higher cancer risk: Arsenic and chlorine byproducts, after years of drinking them.
  • Weaker immunity: Some forever chemicals (PFAS) build up in the body and can weaken children's response to vaccines.
  • Dry skin: Chlorine in your shower water pulls moisture out of skin, more so for people with eczema.
How the tap test works
  1. Order in the app
  2. Fill the bottles at your tap
  3. Mail it back
  4. An independent lab tests your sample
  5. Your results and updated plan

You can buy a tap test without a membership. Members pay 20% less on every lab test.

See the tap test
Two sample bottles and a plain mailer box on a stone counter beside a kitchen tap.
  • Your water system's resultsReports from the system serving your address
  • Your tap testYour sample, checked for over a hundred substances

Every result checked against its health goal

1 of 4

We watch the air around your home.

Nearby monitors show what's in the air right now. Satellite smoke maps and forecasts show what's on the way. We check the readings against each other, then tell you when to close the windows, run a purifier or open up again.

  • Sick more often: Polluted air weakens your lungs' defenses. Doctor visits for chest infections, flu and RSV rise in the weeks after a pollution spike.
  • Asthma attacks: Smog and smoke irritate the airways and can trigger an attack, especially in children.
  • Heart and lung disease: Years of breathing fine particles raise the risk of both and can shorten life.
An open steel window onto a garden of olive trees and lavender, a linen curtain beside it.

  • Monitor 0.9 miles away, read 6 minutes ago
  • Monitor 1.8 miles away, read 14 minutes ago
  • Monitor 2.6 miles away, read 9 minutes ago
  • Smoke seen by satellite

Smog forecast from 1 pm. We'll tell you to close the windows before it arrives.

Measured

  1. 7 amGood
  2. 8 amGood
  3. NowGood

Forecast

  1. 10 amGood
  2. 11 amGood
  3. 12 pmFair
  4. 1 pmPoor
  5. 2 pmPoor
  6. 3 pmPoor
  7. 4 pmPoor
  8. 5 pmPoor
  9. 6 pmPoor
  • The three nearest monitors, checked against each other
  • Only readings from the last 90 minutes
  • Six pollutants, each judged over the hours that matter for it
  • Satellite smoke every 3 hours, forecasts 5 days out

Know when to get outside and when to lower the lights.

We combine your home's sun path with hourly cloud and UV forecasts, five days ahead. We choose a morning daylight window, move it indoors when the air is poor, and work back from your bedtime to time dimmer evenings.

  • More alert mornings: Bright light early in the day helps you wake up and sets your body clock for the night ahead.
  • Falling asleep sooner: Bright light before bed delays the hormone that makes you sleepy. In lab studies, ordinary room light held it back by up to 90 minutes.
  • Less time awake at night: In real homes, people with brighter evenings spent more time awake after going to bed.
  • The sun's path, computed for your address every day
  • Cloud, sunlight and UV, hour by hour, five days out
  • UV on the WHO lines: protect from 3, high from 6
  • Lamps low and dark by, set from your bedtime

Summer, June 21 · Southern California · Sunrise 5:41 am · Sunset 8:04 pm

  • The sun's path, computed for your address every day
  • Cloud, sunlight and UV, hour by hour, five days out
  • UV on the WHO lines: protect from 3, high from 6
  • Lamps low and dark by, set from your bedtime

We tell you what to buy, and why.

Home health products sell on fear and trends. The numbers that decide whether one works sit in the spec sheet: CADR, HEPA, MERV, NSF/ANSI. We read those, then match the right one to what we found in your home and the room it has to work in.

Not the one with the best ad.

  1. Air: Smoke days ahead. Your child has asthma. Their bedroom: 300 sq ft.

    Based on what you told us, look for: 200+, Smoke CADR. A HEPA purifier with a smoke CADR of 200 or more, sized for that room.

    CADR is the clean air rate. The rule of thumb is two thirds of the room's square feet: 200 for 300.

  2. Water: Home built in 1978. A baby on formula. Lead found at the tap.

    Based on what you told us, look for: NSF/ANSI 53, certified for lead. A filter certified for lead (NSF/ANSI 53), under the sink, for drinking and formula water.

    Look for NSF/ANSI 53 certification for lead reduction. "Reduces lead" on the box is not a certification.

  3. Light: Groggy mornings. Bright white kitchen light at 10 pm. Bedtime: 10:30 pm.

    Based on what you told us, look for: 7:30 pm, lamps low, 3 hours before a 10:30 bedtime. Warm, dimmable bulbs where you spend evenings. Lamps low at 7:30 pm.

    Three hours before a 10:30 bedtime, so melatonin can rise.

The standards we hold ourselves to

These are the rules every page, grade and recommendation has to pass.

Explore the science
Sources
Published, peer-reviewed studies first, meaning other scientists checked the work before it was printed. Then guidance from public health agencies such as the EPA, CDC, NIH and the World Health Organization. Never blogs, sellers or press releases.
The bar
We grade against the health goal, not the legal limit, and show you both.
Freshness
Every science page shows when it was last reviewed. Air readings older than 90 minutes are never used. Water records update as they're released.
Independence
Your tap test runs at an independent certified lab with no stake in what we recommend.

Three of the studies behind your guidance

What sources do you use?

Studies published in scientific journals and reviewed by other researchers come first, then guidance from public health agencies such as the EPA and the World Health Organization. Our science pages link to every original source.

How do you decide what to test?

We test for substances that can reach a level that affects health in homes like yours, that a certified lab can measure reliably, and where a result would change what you should do.

How does new research change your advice?

We review new studies and health guidance as they come out. When the findings change our advice, we update it and show the review date on the science page.