01 · Local supply
Water starts here
Your tap water may come from groundwater, reservoirs, imported water, or a mix of local and regional sources.
Your results
Contaminants Detected
Fair
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You shower with this water every day. See how science says it could affect your hair and skin.
01/01
How trace compounds still end up in your water
01 · Local supply
Your tap water may come from groundwater, reservoirs, imported water, or a mix of local and regional sources.
02 · City treatment
Before reaching your home, water moves through municipal treatment and a network of pipes, storage tanks, and distribution systems.
03 · What remains
Chemicals from homes, medications, personal care, industry, and runoff can enter waterways. Treatment cuts many substances, but not every trace compound the same way.
04 · Your shower
That same water coming through your showerhead runs across your hair, scalp, face, and skin every day.
05 · Shower steam
Hot water creates steam and fine droplets in the air around you, so your shower water doesn’t only touch your body. You breathe it in too.
OSLO isn’t here to flood you with fear. We built this report so you can see what’s actually in your tap — then get back to living offline. Clear water knowledge. Real skin-and-hair context. No jargon wall.
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We match your ZIP to public utility testing and score finds against EWG health guidelines — stricter than legal tap-water limits. When city-level data isn’t available, we say so and show a country reference instead of inventing certainty.
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Every OSLO shower filter ships with a 30-day money-back guarantee. Try the piece in real life — cafés, travel, late nights with friends. If it isn’t for you, we’ll make it right. We stand behind what we make because we use it ourselves.
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The most common things people ask after checking their water.
In the U.S. we match your ZIP to the latest public utility testing we can find, then score finds against EWG health guidelines. Outside the U.S. we show an honest country reference when city-level data is not available yet.
Heat can push chlorine byproducts into the air and onto skin. An 8-minute hot shower can mean about 5.5× the exposure of drinking a single glass of the same water, especially when trihalomethanes are present.
The index scores how many contaminants exceed guidelines, how many were detected, and how far over the highest finds land. Lower scores mean a tougher report. Most utilities land at a C or D.
Use it as a clear read on what is in your local supply, then decide what changes matter for your home. Share the report, check another postal code, or keep scrolling the skin and hair notes above.
Where does it come from?
The Environmental Working Group is a nonprofit organization that publishes research-based health guidelines for tap water. Its guidelines are intended to help people understand potential long-term exposure levels.