Why Does My Sprinkler System Have Low Water Pressure? Explained

A sprinkler system requires water pressure between a certain range, which is from 30 to 50 pounds per square inch. However, the pressure we want from the system is not the pressure we get. After I found out the problems, I figured out a few ways of increasing the pressure.

Necessary steps include:

  • Positioning the level of water supply line above the sprinkler system
  • Adjusting the sprinkler head
  • Cleaning the sprinkler head
  • Installing the boost pump
  • Checking the backflow preventer valves
  • Repairing the water pipes
  • Dealing with tree roots into the pipes
  • Reporting to the water company about the issue

Before jumping to the meat of this article, you have to know the type of sprinkler systems you are using and its connection to the water source. If you are using a simple sprinkler pump, then you have to check whether it is connected to the garden hose or an independent water source.

Knowing the real cause of this problem systems of sprinklers is quite easy.

  • The malfunctioning of the backflow preventer valve
  • Dirt formation in the sprinkler heads
  • Poor adjustment of the heads
  • Problem with the shut-off valve
  • Crushed or broken pipes
  • Growth of roots or shrubs into the pipes
  • The municipal supply of water issue

Why Does My Sprinkler System Have Low Water Pressure

Problem-1: The Lesser Height Difference Between the Water Line and The Machine

One of the main reasons for low water pressure is the lack of knowledge about the installation process of the irrigation system. If the elevation difference between the main water line and the device is more than 1 foot, the pressure decreases by 0.433 psi and vice versa.

Solution-1:  Keep the Height Difference 1 Foot

For having adequate water pressure, the water pipe should be elevated 1 foot from the sprinkler. Therefore, you have to plan properly before fixing it.

Problem-2: Clogged Sprinkler Heads

After cleaning your lawn, if you have not checked the head, then it can be another reason for the reduced water pressure. These can get clogged up with dirt or grass that might have grown for too long as plant debris mostly gathers on the top of the sprinkler head.

Solution-2: Clean the Heads

Overgrown grass can work as a barrier to water flow. After a few months of usage, if there is a sudden decrease in water flow, clean the heads (and cut the grass around it). Moreover, make sure that these are cleaned daily.

Problem-3: Mispositioning Of the Sprinkler Heads

Sometimes the sprinkler heads might not be adjusted properly, which reduces the water pressure to a certain level. This mostly happens when you are busy fixing the vital parts and miss the smaller ones, considering them trivial.

Solution-3: Adjust It

You can simply turn the screw counterclockwise and see how the water pressure increases instantly. However, you have to keep in mind that this technique works with specific sprinkler heads only.

Problem-4: Malfunctioning of The Backflow Preventer Valve

One of the significant problems of insufficient water pressure is the partial opening of the valves. The backflow valve consists of two main pipes— horizontal and vertical. These two pipes have individual handles that can be rotated to open the valves.

So, you would have to see whether the pipes are the culprit behind the decreased water pressure, let me tell you how.

Solution 4:  Turn the Handles In The Correct Way

What you have to do is simply turn the handles parallel to the pipe, which will ensure the fluent flow of water. Even if only one handle is rotated, it is enough to hinder the water current.

Problem-5: The Shut-Off Valve Problem

It might happen that the shut-off valve you are using to connect the system and the supply of water line from your home is not opened correctly. This disruption will restrict the water movement and leave you unsatisfied with the water flow.

Solution-5: Check the Shut-Off Valve

The sprinkler system requires sufficient and fast water flow from the mainline to disperse enough water. Therefore, you have to check and make sure that these valves are fully open.

Problem-6: Growth of Tree Roots into The Pipes

This problem usually skips one’s mind while it causes permanent damage to the pipes or reduces the water pressure immensely. As roots grow deep into the ground, they can easily break and penetrate the lines, blocking the usual water pathway. Water fails to cross the roots at the same speed as before.

Solution-6: Take Care of The Surroundings

It is quite challenging to remove the roots from the pipe; either you have to call a plumber to fix it or replace the tube altogether. On the other hand, you can set the device away from the trees.

Problem-7: Crushed or Broken Pipes

If you have recently installed fences or anything else into the grounds, there is a high chance of pipes being broken and cause water leakage.  As water seeps out, the constant flow gets disrupted, resulting in a pressure drop.

Solution-7: Fix the Water Lines

After checking the whole device in and out, if you have still not found the problem, you should check whether the ground is wet or dry. The water bubbling from a particular place signs the leakage and demands an immediate call to action. As it is hard to repair the lines, expert help will come in handy.

Problem-8: No Visible Problem

When the pressure of water is too low, and you get tired of checking the head, pipes, and valves more than once, there remains only one way to get the desired outcome—installing a separate device to aid the sprinkler system.

Solution-8: Install the Boost Pump

Buy a booster pump and get enough water pressure for your lawn.

Problem-9: Municipal Water Supply Issue

Are you experiencing a sudden drop in water pressure in the daytime but gets better at night? Is it happening in your entire neighborhood? If you can understand these changes, you don’t have to worry about your sprinkler pump.

Solution-9: Report the Issue

You can immediately contact the water company and check whether it is routine maintenance or a municipal line malfunction. They will take specific steps to solve it and let you know when you can get the desired result.

Final Words

If you face the mentioned issues, no need to panic. Instead of getting stressed, just take a breather. There is a workaround to all the problems you face. So, your job is to identify the problem- then act accordingly. Also, remember to examine the sprinkler regularly to avoid unexpected difficulties.

I hope this article helped you get the high water pressure you thought was lost.

Leave a Comment

Your email address will not be published. Required fields are marked *

Scroll to Top