Ph Question - Tap water is 8.9 -Clackimus Coots Organic Soil

I am referring to the hypothetical and the belief that pH is self regulated in EVERY organic soil regardless whether it is too high or too low.

1/4-lb finely ground sulfur per cubic yard of soil will lower pH by 0.5-1.0 point. Carefully adding too much at once as it can create anaerobiosis (too little oxygen) in the soil. Max application rate, 1/2-lb/cu. yd. soil per season.