What causes tap water to turn yellow?

We come into contact with and use tap water every day. It is the most familiar to everyone in our daily lives, so the question of whether drinking water is healthy is also of great concern. Through some investigations, we found that many families have encountered yellow tap water. Generally, the tap water we drink is processed, but some water quality is still not very good after treatment. So what is the reason for the yellow tap water?

1. When the water source is replaced, the water quality and the properties of the water supply pipe are temporarily mismatched, causing the rust in the pipe to dissolve and make the water yellow. For users who have been using groundwater, this phenomenon is particularly obvious after the water source is replaced.

2. The pipeline from the first valve after the user's main meter to the user's home is corroded due to long-term use or quality problems of the pipe, resulting in secondary pollution of tap water. This phenomenon is particularly obvious in the morning or after not using water for a long time. It is recommended that users drain the water before use.

3. For users of secondary water supply facilities, since the property owners fail to regularly clean and disinfect the pools or tanks as required, resulting in secondary contamination of tap water, it is recommended that users regularly clean the secondary pressurization facilities.

Why is tap water yellow?

4. If the water inside or around the user is temporarily yellow due to pipe maintenance or switching of water meter valves, it is recommended that the user drain the water before use.

Can I drink tap water directly?

Tap water is a water source that meets national standards for drinking water. It is produced under strict quality control by the water plant. You can drink boiled tap water with complete confidence. But tap water cannot be drunk directly, which causes inconvenience to life. Moreover, the water tanks in some high-rise buildings are also at risk of contamination. Coupled with the aging of water pipelines in many cities, the quality of tap water is becoming increasingly unreliable.

Although the sanitary quality of tap water meets national health standards, it is best not to drink unboiled tap water, because tap water is drinking water for daily life, not direct drinking water. There is a huge difference between the two. In addition, boiled water that has been left for more than 24 hours is not suitable for drinking.

Experts point out that frequently drinking water that has not been fully boiled increases the likelihood of developing bladder cancer and colorectal cancer by 21% to 38%. Because the harmful bacteria in tap water must reach 100 degrees Celsius to be completely killed.

How to test tap water

When you brush your teeth with tap water, you smell a strong bleach smell that makes you feel sick; when you boil water, a layer of white scale forms on the kettle; when you wash clothes with water, the clothes become stained with yellow and dark colors. These phenomena indicate that the tap water may have been contaminated.

1. Look: Use a transparent cup to collect half a cup of water in a well-lit place, and observe whether there are any tiny substances suspended in the water; let it stand for about half an hour, and then observe whether there is any sediment at the bottom of the cup. If there is any, it means that the suspended impurities in the water exceed the standard.

2. Smell: Smell the tap water to see if there is any smell of bleach. If you can smell bleach, it means that the residual chlorine in the tap water may exceed the standard.

3. Taste: When drinking boiled water, check whether there is a smell of bleach. If the water does not taste sweet but instead smells like bleach, this is also a sign that the bleaching powder content exceeds the standard.

4. Check: When checking the inner wall of the kettle at home, if you find that there are lumps of impurities on the inner wall of the kettle, it means that the tap water contains scale.