Borehole Yield Test and Compliance in Randburg

Your borehole was drilled, but how much water can you actually draw? A yield test tells you the sustainable extraction rate — so your pump is sized correctly and your borehole lasts decades, not years.

Yield Measurement

Pump Testing

Flow Analysis

"The driller said we had good water. Three months later the borehole was running dry every afternoon."

A Blairgowrie homeowner drilled a borehole with a reported yield of 1,500 litres per hour. They installed a large submersible pump to maximise extraction. Within three months, the borehole was running dry by 3pm every day. The pump would cavitate, lose prime, and overheat.

The problem: the driller did a quick blow test, not a proper yield test. The actual sustainable yield was only 600 litres per hour — enough for the household, but not at the extraction rate they were running.

We conducted a proper 24-hour yield test, downsized the pump, installed a pump controller with dry-run protection, and the borehole has run perfectly for two years since.

The point is straightforward: a blow yield from the driller is not the same as a controlled pump test. Without proper yield testing, you risk over-extracting, damaging your pump, and permanently reducing your borehole's capacity.

Borehole Yield Testing Services

From pump rate measurement to compliance certificates and pump sizing recommendations. We test your borehole's true capacity so every decision is based on real data.

Pump Rate & Recovery Testing

We measure how fast your borehole produces water (yield rate) and how quickly it recovers after extraction (recovery rate). This data determines the correct pump size and extraction schedule for sustainable long-term use.

Static water level measurement
Pump rate determination
Recovery rate monitoring
Sustainable yield calculation
24-hour testing available

Compliance Certificates

Some municipalities and insurance companies require borehole yield certificates. We provide professionally documented yield test reports with all measurements, methodology, and recommendations — suitable for compliance and insurance purposes.

Professional documentation
Municipality-compliant format
Insurance-accepted reports
Signed and dated certificates
Methodology included

Pump Sizing Recommendations

The yield test determines the maximum sustainable extraction rate. We use this data to recommend the correct pump — not too powerful (damages the borehole) and not too weak (insufficient supply). Right-sizing saves money and protects your borehole.

Pump size matched to yield
Extraction schedule planning
Dry-run protection advice
Controller recommendations
Long-term borehole protection

Borehole Yield Testing Across Randburg

From pump rate measurement to compliance documentation, here is some of our borehole yield testing work in the area.

Andy Plumbers conducting borehole yield test in Randburg

Yield Test Setup

Randburg - Installing monitoring equipment for controlled pump test

Pump Rate Measurement

Fairland - Measuring extraction rate during controlled pump test

Borehole recovery rate monitoring in Northcliff

Recovery Monitoring

Northcliff - Tracking water level recovery after pump test

Completed borehole yield test with compliance report in Randburg

Compliance Documentation

Randburg - Full yield test report with pump sizing recommendations

How Borehole Yield Testing Works

From static level measurement to a full report with pump sizing recommendations. We handle the complete process so you know exactly what your borehole can deliver.

Static Level Measurement

We measure the static water level in your borehole before any pumping. This baseline tells us where the water naturally sits and gives us a reference point for measuring drawdown during the pump test.

Pump Test & Drawdown Monitoring

We pump water at a controlled rate while measuring how quickly the water level drops (drawdown). We monitor this over several hours — or 24 hours for a comprehensive test — to determine the sustainable yield rate.

Recovery Measurement & Report

After pumping stops, we measure how quickly the water level recovers to its static level. The recovery rate tells us the aquifer's recharge capacity. You get a full report with yield rate, recovery rate, and pump sizing recommendations.

Why Yield Testing Matters for Your Borehole

A yield test protects your investment, sizes your pump correctly, and gives you the data you need for compliance. Here is why it matters.

Right Pump for Your Borehole

An oversized pump extracts water faster than the aquifer can recharge. This damages the borehole over time — collapsing screens, pulling in sand, and eventually reducing yield permanently. A proper yield test prevents this by matching pump size to sustainable extraction.

Correct pump sizing
Borehole lifespan protection
No over-extraction damage
Optimal extraction schedule

Professional Documentation

Our yield test reports include static water level, pump rate, drawdown measurements, recovery data, sustainable yield calculation, and pump sizing recommendations. Suitable for municipality compliance, insurance requirements, and property sales documentation.

Detailed test methodology
All measurements documented
Municipality-compliant format
Insurance-accepted reports

Existing Borehole Assessment

If your borehole was drilled years ago and never properly tested — or if yield seems to have dropped — we can test it now. Yield changes over time due to aquifer conditions, nearby drilling, and seasonal patterns. A current test tells you exactly where you stand.

Re-test older boreholes
Yield decline investigation
Seasonal yield comparison
Aquifer health assessment

Complete Borehole Service

Yield testing is one part of our complete borehole service. We also handle pump installation, house connection, water quality testing, filtration, and annual maintenance. One plumber for your entire borehole system.

Borehole Yields Across Randburg

Borehole yields vary significantly across Randburg. Fairland typically sees 600-1,500 litres per hour. Northcliff can be 400-1,200 depending on depth and geology. Blairgowrie and Ferndale tend toward higher yields due to favourable rock formations in those areas.

Seasonal variation also plays a role. Yields often drop during the dry winter months as the water table falls, and recover after the summer rains recharge the aquifer. A yield test during the dry season gives you the most conservative — and most useful — data for pump sizing.

If you are planning to install a pump or connect your borehole to your house plumbing, a yield test should be the first step. We also handle borehole pump installation, borehole connections to house plumbing, borehole water quality testing, borehole maintenance, and can provide a borehole cost guide to help you plan your budget.

Beyond Fairland and Northcliff, we regularly conduct yield testing in Linden, Parkhurst, Bordeaux, Blairgowrie, and Ferndale. Each area has its own typical yield range, and understanding local aquifer conditions helps us provide accurate pump sizing recommendations from the start.

Common Questions About Borehole Yield Testing

What is a borehole yield test?

A yield test measures how much water your borehole can sustainably produce. We pump water out at a controlled rate while measuring the water level drop (drawdown) and recovery speed. This tells us the maximum extraction rate that your borehole can sustain without damage.

How long does a yield test take?

A standard pump test takes 4-8 hours. A comprehensive 24-hour test is recommended for new boreholes or where precise data is needed for compliance certificates. We monitor continuously throughout the test period.

Why can't the drilling company just tell me the yield?

Drillers often do a quick "blow yield" during drilling which gives an approximate figure. This is not the same as a controlled pump test that measures sustainable yield under real extraction conditions. Many boreholes produce less than the blow yield suggests.

How much does a borehole yield test cost?

A standard yield test typically costs R3,000-R6,000 depending on duration and whether you need a formal compliance certificate. A 24-hour test with full documentation costs more than a 4-hour assessment. Contact us for a specific quote.

Do I need a yield test if my borehole is already working?

It is strongly recommended if your pump was never properly sized, if yield seems to have decreased, or if you are planning to increase extraction (connecting to house plumbing, for example). Over-extraction from an improperly sized pump can permanently damage your borehole.

Know Your Borehole's True Capacity

Professional yield testing — so your pump is right-sized, your borehole is protected, and your water supply is sustainable.

Book Your Yield Test Call 011 477 1118