Examination Fees
| Tests | Current SFS Member Fee (View membership information) | Non-Member Fee |
| Practice Quiz (self-examination, 10 online images) | Free. Take the quiz | Free. Take the quiz |
| Citizen Scientist Order-Level Exam | $20 | $25 |
| Family-Level Exam (40 online images, aquatic insects only) | $75 | $100 |
| Genus-Level Macroinvertebrate Exam (20 specimens or online images; any group) | $275 | $375 |
| Genus-Level 1 Diatom Exam (60 specimens or online images) | $75 | $100 |
| Species-Level 2 Diatom Exam (100 online images and questions) | $275 | $375 |
| Recertification By petition or image or specimen test (Due after five years except for species-level 2 diatoms, which is due after eight years) | $275 first group $200 each additional group | $375 each group |
| All examination re-sits (after 90% on first attempt, one re-try) | $125 Refunded if successful | $125 Refunded if successful |
| Re-submission of petition (after TCC denial; one re-submit per group) | $100 | $125 |
Payment Options
Use the button below to pay by credit/debit card via PayPal – you do not need a PayPal account — or to mail a check payment. Please note: A place in the examination cannot be assured nor are test results released until payment is received. For those requiring it for accounting purposes, the tax number for the Stroud Center is EIN 52-2081073.