How to Diagnose Bad Water Pressure Due to Clogged Water Pipes

  • CLOGGED SUPPLY PIPES, DIAGNOSIS - CONTENTS: Guide to Diagnosing Bad Water Pressure due to clogged water supply piping in a building. How to find where water pipes are clogged and how to repair this problem. How to diagnose loss of water pressure or loss of water in a building
  • POST a QUESTION or READ FAQs about clogged water pipes and their effect on water pressure; how to repair or replace clogged water pipes for better water flow and pressure in a building.

InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website.

This article explains how to Diagnose and Cure Bad Water Pressure Due to Clogged Water Supply Pipes - how to diagnose the loss of water pressure and the need for a replacement water pressure tank and water pump.

The process of diagnosis and the costs of the repair are explained. Consumer advice on saving money on well repair costs includes a review of the parts and labor costs of a typical well pump and pressure tank replacement case.

Green links show where you are. © Copyright 2017, All Rights Reserved.

How to diagnose clogged building water supply piping as a cause of bad water pressure

Clogged steel piping (C) Carson Dunlop Associates

Clogged water supply piping can cause poor water flow in a building. This can occur suddenly from debris clogging a delivery pipe, often at a turn or "elbow" in the piping, but that's not common.

[Click to enlarge any image]

If the building water supply piping is blocked usually this is a long-standing problem.

Examples of causes of poor water pressure due to blocked pipes include

The sketch (above left), courtesy of Carson Dunlop Associates shows how galvanized steel water supply piping becomes clogged from rusting or mineral deposits.



and see MUNICIPAL WATER PRESSURE DIAGNOSIS or WELL WATER PRESSURE DIAGNOSISwhere we describe the effects of clogged piping on water flow and offer remedies for this problem.

If only hot water pressure and flow are poor, also see CLOGGED SUPPLY PIPES, HOT WATER.

There are two useful diagnostic tricks to determine if building water piping is clogged:

A main water supply pipe failure between the municipal water main in the street (or from a private well) and water supply pipes in the building the building, can occur, perhaps by leaking or by becoming clogged with rust or minerals so that water is not being delivered to the home at good pressure or not at all (if the water line has burst).

In cold climates, the water supply line may have frozen outside or even in the building at an un-heated location.

Reader Question: how do I improve water pressure at a higher building location?

Relationship between water pressure & building height (C) CarsonDunlop Associates used with permission InspectApedia.comEddie said:

I have a wr60 pressure tank near lake being fed by submersible pump. Settings are 40/60 and tank pressure is 38 psi. There is a second pressure tank approx 600 feet away up a hill in the house.

The air pressure in this tank is set at 38 psi. There is never any water entering this tank

The water pressure reading at this tank is 34 psi which I believe is the line loss from the 60 psi reading down at lake. Can the cause of no water in this tank because the air pressure is higher than water pressure . Can I lower air pressure to 32 psi.


Eddie you give horizontal distance but not vertical distance between the two tanks - that height is a factor to consider

. But if absolutely no water is entering the upper tank, other explanations include that water pressure is not high enough to lift water the height distance between the tanks or the tank is an internal bladder type and the bladder has stuck to itself.

Our illustration shown here and discussed in our article WATER PRESSURE BOOSTER PUMP shows that if incoming water pressure at ground level were at 60 psi, at a building plumbing fixture that is 30 feet higher the effective pressure would be around 47 psi.

Quoting from that article

For every one foot we push water up, we lose 0.434 psi. Another way of saying this is that it takes one psi to move water up 2.31 feet.

Water Pressure Diagnosis & Improvement


Continue reading at CLOGGED SUPPLY PIPES, REPAIR or select a topic from closely-related articles below, or see our complete INDEX to RELATED ARTICLES below.

Or see PEX BRASS CONNECTOR LEAKS where we discuss corrosion build-up in brass elbows & tees that can clog PEX piping systems.

Suggested citation for this web page

CLOGGED SUPPLY PIPES, DIAGNOSIS at - online encyclopedia of building & environmental inspection, testing, diagnosis, repair, & problem prevention advice.


Or use the SEARCH BOX found below to Ask a Question or Search InspectApedia


Frequently Asked Questions (FAQs)

Click to Show or Hide FAQs

Ask a Question or Search InspectApedia

Questions & answers or comments about clogged water pipes and their effect on water pressure

Use the "Click to Show or Hide FAQs" link just above to see recently-posted questions, comments, replies, try the search box just below, or if you prefer, post a question or comment in the Comments box below and we will respond promptly.

Search the InspectApedia website

Comment Box is loading comments...

Technical Reviewers & References

Click to Show or Hide Citations & References

Publisher's Google+ Page by Daniel Friedman