The georgia two compartment septic tank rule is one of the most misunderstood requirements in the state's septic code. Since February 20, 2000, every new septic tank installed in Georgia must have two compartments and an effluent filter. It applies statewide across all 159 counties with no exceptions. If your home was built or your tank was replaced after that date, you have a two-compartment tank — and knowing how it works changes how you maintain it.
Georgia was ahead of most states in adopting this requirement. The dual-compartment design significantly improves effluent quality before it reaches the drain field, which extends drain field life and reduces environmental contamination. Understanding why the rule exists and how it affects your system helps you maintain it properly.
A conventional single-compartment tank is just one big box. Wastewater enters, solids settle to the bottom, grease floats to the top, and the liquid in the middle (effluent) flows out to the drain field. The problem is that turbulence from incoming wastewater stirs up settled solids, and those suspended particles can exit with the effluent.
The georgia two compartment septic tank solves this by adding an internal wall (baffle) that divides the tank into two chambers. Wastewater enters the first compartment where the heaviest settling occurs. Partially treated liquid then passes through a slot or pipe to the second compartment for additional settling. By the time effluent leaves the second compartment, it carries far fewer suspended solids.
The first compartment is typically two-thirds of the total tank volume, and the second compartment is one-third. For a standard 1,000-gallon tank, that means roughly 667 gallons in the first chamber and 333 in the second. Both compartments need pumping during maintenance, though the first accumulates sludge much faster.
Georgia's rule goes further than just requiring two compartments. Every post-2000 tank must also include an effluent filter at the outlet of the second compartment. This is the two compartment tank GA rule's most practical feature for homeowners.
The effluent filter is a screen or cartridge that catches any remaining solids before they reach the drain field. A properly functioning filter prevents the fine particles that cause biomat buildup and premature drain field failure. Georgia's requirement for effluent filters has measurably extended drain field lifespans across the state.
Maintenance is non-negotiable. The filter must be cleaned every 1 to 2 years — or sooner if you notice slow drains. A clogged filter causes exactly the backups it was designed to prevent. Many homeowners clean the filter themselves by removing it and hosing it off over the first tank compartment (so the solids go back into the tank, not onto the ground). Others have the pumping company clean it during scheduled pump-outs.
Replacement filters cost $75 to $200 depending on the model. If your filter is damaged or deteriorated, replace it immediately — running without a filter defeats the purpose of the two-compartment design and puts your drain field at risk.
For homeowners upgrading an older single-compartment tank or replacing a failed system, the georgia septic tank effluent filter requirement affects your project scope and cost.
New installations: All new tanks come with the baffle and effluent filter port pre-installed. The contractor installs the filter as part of the standard setup. No additional cost beyond the filter itself ($75 to $200).
Replacing a single-compartment tank: If your pre-2000 single-compartment tank fails and needs replacement, the new tank must be a two-compartment design with an effluent filter. You cannot replace a failed tank with another single-compartment unit. This typically adds $200 to $500 to the replacement cost.
Exception for repairs: If your existing single-compartment tank is structurally sound but needs minor repairs, you are not required to retrofit it to two compartments. The rule applies to new installations and full replacements only. However, adding an effluent filter to an existing single-compartment tank is a smart upgrade that costs $150 to $400 including installation.
Tank sizing in Georgia is based on bedroom count. The minimums under current georgia septic tank requirements are:
| Bedrooms | Minimum Tank Size |
|---|---|
| 1-3 | 1,000 gallons |
| 4 | 1,250 gallons |
| 5-6 | 1,500 gallons |
Pumping a two-compartment tank requires accessing both compartments. Georgia's georgia septic tank requirements mean your pumper needs to open both lids (or access both through risers) and pump each chamber. Some pumpers charge extra for this — typically $25 to $75 — though many include it in their standard fee.
The first compartment accumulates the majority of sludge and should always be pumped fully. The second compartment usually has less buildup but still needs to be checked and pumped as needed. The effluent filter should be cleaned during every pump-out.
If your tank has no risers, the pumper has to dig to access both lids. Georgia's Piedmont red clay makes this digging slow and expensive. Installing risers on both compartments costs $300 to $600 total and saves money on every future pump-out. This is one of the best investments you can make for a georgia two compartment septic tank.
For pumping schedules and maintenance guidance, read our Georgia septic maintenance checklist. Find certified pumpers through our Georgia septic pumping directory. For full regulatory details, see our Georgia septic regulations guide.
The requirement took effect on February 20, 2000. All tanks installed after that date must have two compartments and an effluent filter. The rule is codified in the DPH Manual for On-Site Sewage Management Systems under Chapter 511-3-1.
No. Existing single-compartment tanks that are functioning properly do not need to be replaced. The two-compartment rule applies to new installations and full tank replacements only. However, adding an effluent filter to your existing single-compartment tank is a recommended upgrade that protects your drain field.
A 1,000-gallon two-compartment concrete tank costs $1,200 to $2,500 for the tank alone. A 1,250-gallon tank runs $1,500 to $3,000. Installed as part of a complete system, the two-compartment design adds roughly $200 to $500 compared to what a single-compartment equivalent would cost. The long-term drain field protection far outweighs this premium.
Yes. Cleaning the effluent filter is a task many Georgia homeowners handle themselves. Remove the filter from its housing, hose it off over the open first compartment of the tank (so debris falls back in), and reinstall. Wear gloves and old clothes. If the filter is damaged, cracked, or deteriorated, replace it — they cost $75 to $200 and are available from septic supply stores.
Connect with licensed professionals in Georgia for your septic or well water needs.
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