Will High-pH Tap Water Raise Soil pH? How to Manage It

Your soil pH is 6.3–6.8, but tap water is pH 8.4. You’re using Ocean Forest Fox Farm soil and wonder if watering will raise soil pH, and whether you should adjust water pH.

Effect of Alkaline Water

Alkaline water will raise soil pH somewhat, depending on soil type and water-holding capacity. However, fertilizer tends to lower pH.

Practical Monitoring and Adjustment

• Buy an inexpensive pH meter (<$30) and test soil regularly.
• Adjust soil pH directly if needed: sulfur or aluminum sulfate to lower; lime or baking soda to raise.
• Water pH adjustment equipment is costly; easier to manage soil pH.