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This document provides detailed instructions on how to conduct percolation tests for septic system evaluation, including test procedures, hole preparation, presoaking requirements, and measurement
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How to fill out Percolation Tests

01
Gather the necessary materials: a shovel, measuring tape, and gravel or sand.
02
Select a test site that reflects the area where the system will be installed.
03
Excavate holes at least 12 inches deep and 6 inches wide, spaced approximately 10-15 feet apart.
04
Fill each hole with water and allow it to soak in for at least 24 hours to saturate the soil.
05
After soaking, refill each hole with water to a specific level (usually 12 inches) and start your timer.
06
Measure the drop in water level at regular intervals (e.g., every 30 minutes) until the water level stabilizes.
07
Calculate the percolation rate by averaging the time it takes for water to drop a specified amount.

Who needs Percolation Tests?

01
Homeowners planning to install a septic system.
02
Real estate developers needing to determine land suitability for building.
03
Environmental engineers assessing the feasibility of waste systems.
04
Farmers needing to evaluate land for irrigation and drainage.
05
Regulatory agencies ensuring compliance with health and safety codes.
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After clearing the hole of loose debris, fill the hole up to 300mm deep with water and leave it to seep away overnight. The following day, refill the test hole with water, again up to a minimum depth of 300mm. Observe how quickly the water seeps away.
The percolation rate is determined by conducting a percolation (perc) test. The percolation test measures the amount of time it takes for water in a test hole to drop 1 inch.
Calculate the percolation rate in inches/hour by dividing 60 minutes by the time it took to reach 1 inch. For instance, if it took 3 minutes to reach 1 inch, divide 60 by 3, for a percolation rate of 20 inches per hour.
If the Percolation Value (Vp) exceeds 140 seconds, the soil is not suitable for drain fields. If the value is between 100 and 140 seconds (about 7-10 hours to fall 250mm), under drains are desirable.
A percolation test, or perc test, is a procedure performed to review water drainage in different soils.
If the Percolation Value (Vp) exceeds 140 seconds, the soil is not suitable for drain fields. If the value is between 100 and 140 seconds (about 7-10 hours to fall 250mm), under drains are desirable.
Determine the percolation rate by refilling each hole with water to a depth of at least 300mm and observe the time in seconds for the water to seep away from 75% full to 25% full (i.e. a depth of 150mm). 6. Divide this time in seconds by 150. This gives the average time in seconds required for the water to drop 1mm.
Determine the percolation rate – Refill the test holes with water to a depth of at least 300mm and then using a stopwatch see the time, in seconds, for the water to seep away from 75% to 25% full level. Download our Percolation Test Results sheet to record your findings. Divide this time – Divide the time by 150.

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Percolation tests are assessments designed to measure the absorption rate of soil, which helps determine the suitability of a site for the installation of a septic system or drainage system.
Individuals or entities planning to install a septic system or similar wastewater treatment systems on a property are typically required to file percolation tests, often as part of the permit application process.
To fill out a percolation test, one must conduct soil tests in designated holes, record the time it takes for water to drain at specific intervals, and document the results according to local regulations and guidelines.
The purpose of percolation tests is to evaluate soil drainage capacity, which helps determine the design and location of septic systems and ensures proper wastewater treatment and disposal.
Information that must be reported includes the dimensions of the test holes, the depth of soil tested, time intervals for water absorption, specific soil conditions observed, and the location and date of the test.
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