about 40 to 45 psi Click to see full answer. Furthermore, is 70 psi too high for water pressure? The ideal water pressure level is between 50-70 PSI. If your water pressure goes above 70 PSI (even occasionally), you should install a pressure regulator to your main water line. The gauge will read the pressure amount currently being forced out. If it’s too high, contact the plumbing professionals here at Donnelly’s.Beside above, what should mains water pressure be? Water suppliers’ statutory service standard level of mains water pressure is 10 metres/head (or one bar). This means there is enough force/pressure to push the water to a height of 10m. Subsequently, one may also ask, is 100 psi too much water pressure? Water Pressure. High water pressure is major cause of leaks, pipe damage, and wasted water. This water pressure is often well over 100 psi, and too often over 150 psi. However, the maximum recommended pressure for a residence is 80 psi.Is 85 PSI water pressure too high?You will be amazed at how fast the pressure rises and how high it will go. Again, 85 psi is not dangerously high, but it is still higher than necessary and I would recommend a PRV and expansion tank.