Commercial & Research
Cost comparison: eDNA vs traditional biodiversity surveys
June 16, 2025 · 6 min read
Once someone is convinced that eDNA works, the next question is always cost. The honest answer depends on the project, but across most common survey types, eDNA is between two and ten times cheaper per species detected than the traditional equivalent — and dramatically cheaper if you factor in field crew mobilization.
Single-species surveillance
For monitoring a specific target species — an invasive, an endangered fish, a pathogen — species-specific qPCR on water samples is dramatically cheaper than the equivalent trapping or electrofishing effort. A survey program that would have cost tens of thousands can often be replaced with a program at a fraction of the cost, with better sensitivity.
Multi-species inventory
This is where eDNA's advantage is most extreme. A single soil or water sample analyzed with broad metabarcoding primers returns dozens to hundreds of species. Reaching the same list with visual, acoustic, and trapping surveys would take weeks of specialist field time.
Long-term monitoring
eDNA's cost advantage compounds when a program runs for years. Standardized sampling that any field tech can execute keeps costs low and data comparable across years — a chronic problem for programs that depend on specialist observer availability.
Where traditional methods still win on cost
For projects that specifically need individual-level data — mark-recapture, disease diagnostics on specific animals, behavior studies — eDNA cannot substitute and the traditional method's cost is the appropriate baseline.
Hidden costs to consider
Lab turnaround. eDNA runs typically take two to six weeks — build that into project schedules. Sampling design. Poor spatial or seasonal coverage will hurt eDNA more than an intensive traditional survey because eDNA relies on many samples. Reference database gaps. Some regional or tropical taxa are still under-sequenced and produce unresolved hits.
Rules of thumb
For most modern biodiversity questions on North American land, eDNA is now the first-choice tool and traditional methods are the targeted follow-up. Fifteen years ago that was reversed. The direction of travel is unambiguous.