Many families use water every day without knowing whether its pH is within safe limits or not. In fact, pH that is too low or too high can affect the taste, quality, and even safety of water used for household needs.

What is Water pH?

pH is a measure of the acidity or alkalinity of a liquid. pH values are expressed on a scale of 0–14, with the following definitions:

pH < 7 → Acidic

pH = 7 → Neutral

pH > 7 → Alkaline

Natural water usually has a pH of around 6.5–8, depending on soil conditions, water sources, and treatment processes. Changes in pH can be influenced by minerals, carbonates, metal content, and certain contaminants.

Why is pH Important for Water Quality?

pH determines the chemical stability and safety of water. If the pH is outside the ideal range, several problems may arise, such as:

pH too low (acidic)

The water tastes metallic, has the potential to cause corrosion in pipes, makes the water yellowish, and triggers the dissolution of iron or metals from household installations.

pH too high (alkaline)

Water feels slippery, leaves white residue, and affects the effectiveness of soap or detergent.

Changes in pH are not always dangerous, but they can indicate other contaminants that need to be further investigated.

What is the Safe pH Standard for Water?

According to Indonesia’s clean water quality standards (Ministry of Health), the safe pH range for water use is:

pH 6.5 – 8.5

This range is considered stable for daily use, including bathing, washing, and other household needs. If the water’s pH is outside this range, it may require further testing or adjustment through a specific filtration system.

What Causes Abnormal Water pH?

Some common factors that affect household water pH include:

• High natural minerals (calcium, magnesium, carbonate)
• Groundwater affected by certain rock layers
• Metal contamination (Fe, Mn)
• Corrosive piping systems
• Suboptimal water treatment

Since pH only measures acidity or alkalinity, additional testing is still needed to determine the overall condition of the water.

How to Keep Water pH Stable?

Regularly checking water quality helps ensure that the pH is within safe limits and that corrective action is taken if necessary. Certain filtration systems, such as activated carbon or pH balancing media, can help maintain water stability according to household needs.

Understanding water pH and its safety standards helps families determine whether the water used daily is in ideal condition. With proper water analysis and appropriate filtration system recommendations, FLAX supports communities in maintaining water quality that is safe, stable, and comfortable to use—in line with its role as Indonesia’s top water consultant and solution provider.