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[[File:Primtreatpic.png|none|120px|link=Practitioner's Tool / Technology and Operation / Septic_Tanks]]<br/>[[Practitioner's Tool / Technology and Operation / Septic_Tanks|Septic Tanks]]<br>
[[Septic Tank]]
| Residential or commercial sources with a population loading of less than 25 people<br/>
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[[File:Sewlag1.jpg|none|120px|link=Practitioner's Tool / Technology and Operation / Sewage Lagoons]]<br/>[[Practitioner's Tool / Technology and Operation / Sewage_Lagoons|Sewage Lagoons]]
| Small community or institutional sources, such as hospitals. Must be located well away from residential communities due to potential for odors and nuisances<br/>
| Low for areas where available land is plentiful and low value<br/>
[[File:Abr1.jpg|none|120px|link=Anaerobic Baffled Reactors (ABRs)]]<br/>
[[Anaerobic Baffled Reactor (ABR) 1|Anaerobic Baffled <br>Reactor (ABR) 1]]<br>
[[Practitioner's Tool / Anaerobic Baffled Reactor (ABR) 2|Anaerobic Baffled <br>Reactor (ABR) 2]]
| Residential or commercial facilities with a population loading of between 25 and 200 people<br/>
| Low - May be constructed with local materials and labor<br/>
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[[File:Biogas 2.jpg|none|120px|link=Practitioner's Tool / Biogas Systems]]<br/>[[Biogas_SystemsPractitioner's Tool / Biogas Systems|Biogas Systems]]
| For animal manure or other high strength waste. Can be used for small community systems that combine waste from fish and animal operations, people and commercial activities<br/>
| Moderate - Some systems require tight specifications on construction<br/>