Rainwater can contain environmental pollutants such as industrial emissions, dust, or chemicals, which can harm your hair
Rainwater is slightly acidic because of the presence of contaminants which may alter your hair's and scalp's natural pH balance, causing dryness, frizziness, or itching
When you wash your hair with hard water on a daily basis, minerals like calcium and magnesium deposits can form, leaving your hair to appear lifeless, dehydrated, and fragile
As it travels through the atmosphere, rainwater may pick up dirt, pollen particles, bacteria, or bird dropping that will have a negative impact on the health and cleanliness of your hair
Rainwater often lacks the necessary nutrients and minerals that promote hair health. Using rainwater to wash your hair may not provide enough nourishment
Heavy rainfall exposure can cause your hair to become too moist for a long period which leads to weakened hair strands and make them more prone to breakage
Because of the increased moisture, rainwater can cause hair to tangle and matt together. This can be particularly problematic for persons with long or curly hair
Rainwater's wetness might temporarily increase the porosity of your hair strands. This causes the hair to absorb more water, which can cause swelling and damage during combing
Rainwater is unanticipated and uncontrollable. Sudden downpours or heavy rain can leave your hair soaked and unkempt, making it difficult to keep your chosen hairdo
Rainwater may not have the same sanitary standards as purified water. If you have a reactive scalp, it is best to wash your hair using filtered water