I boiled tap water for a month in Beijing and then found out my kettle had a thick layer of white stuff inside

Kurokun

My friend from Poland moved into a Beijing apartment and boiled tap water every day for tea. After a month, she opened her electric kettle and screamed.

The bottom was covered in white scale — a solid, crusty layer of calcium and magnesium deposits. Like geology had happened inside her kettle.

The China tap water reality:

Can you drink it? Officially, tap water in major cities meets national standards at the treatment plant. But the "last mile" — the pipes between the plant and your tap — is where problems happen.

The issues:
• Aging pipes (some from the 1980s) can leach heavy metals
• Rooftop water tanks in older buildings may be poorly maintained
• Chlorine levels vary — sometimes too high, sometimes not enough
• Hard water is common (hence the kettle scale)

What locals actually do:

• Boil it: The traditional method. Kills bacteria. Doesn't remove heavy metals or chemicals.
• Buy bottled: ¥2-3 for 500ml. Expensive long-term but convenient.
• Water dispenser + jugs: ¥15-20 for a 19L jug. Delivered to your door. Most common in apartments.
• Filter + boil: The safest combo. Filter first, then boil.

What my Polish friend does now:

1. Brita filter pitcher (¥80) — filters tap water
2. Electric kettle — boils the filtered water
3. Lets it cool — drinks it as "cool boiled water" (凉白开, liángbáikāi), the most Chinese drink imaginable

Total monthly cost: ~¥30 for filter cartridges. Way cheaper than bottled water.

What about brushing teeth?

Yes, it's fine. Nobody gets sick from brushing with tap water. The risk is from drinking large quantities regularly.

What about ice?

Be careful. If the ice is made from tap water at a street stall, skip it. If it's from a proper restaurant or hotel, it's usually fine (they use filtered water or commercial ice).

Water quality by city (general guide):

Tier 1: Shenzhen, Hangzhou, Shanghai (Pudong) — best treatment plants, newer pipes
Tier 2: Beijing, Guangzhou, Chengdu — generally safe after boiling, but older infrastructure in some areas
Tier 3: Smaller cities and rural areas — filter + boil strongly recommended

The bottom line:

Don't drink Beijing tap water straight from the tap. Boil it, filter it, or buy bottled. Your stomach will thank you.

Also: clean your kettle monthly. That white scale builds up fast.

My Polish friend: "I now appreciate clean water in a way I never did in Europe. I can taste the difference between filtered and unfiltered. I'm basically a water sommelier now."

What's your water setup in China? Filter? Bottled? Delivery jugs?