Countertop reverse osmosis for renters: which ones are actually certified?

Certified countertop reverse osmosis — confirmed on the official listing

Reverse osmosis units are certified under NSF/ANSI 58; the claims next to the model number are the ones that count. A unit can be certified for TDS alone, which proves the membrane works, without any lead or PFAS claim. Carbon-stage claims (PFOA/PFOS, VOC) sit under NSF/ANSI 53 on a separate listing.

AquaTru's under-sink models (ATU100, ATU200) are on the same two listings with the same claims; Bluevua's original RO100ROPOT did not appear on the WQA listing we read — only the Lite, Lite(UV), Travel and YMT.

Countertop RO that did not make the list

• Waterdrop K19 (WD-K19-S-US, WD-K19-H-US, filter WD-K19RF; also the M6 and B1 countertop units) — IAPMO R&T listing W-17249 (NSF/ANSI 58-2024) names them for TDS reduction only. No lead, no PFAS, no arsenic or nitrate claim on the certificate. Not found at NSF or WQA.
• SimPure Y7 family — no listing at IAPMO R&T (model search, 27 Oct 2026), NSF (company search, 26 Oct) or WQA (keyword search, 26 Oct). The maker cites SGS laboratory testing; a lab test is not a certification.
• Frizzlife T900 / WB99, Crystal Quest countertop, KFLOW — no listing found on 26–27 Oct 2026. Frizzlife's certifications (IAPMO W-11831) cover its under-sink carbon units, not the countertop RO.

A TDS-only certification is not nothing: it proves the membrane rejects dissolved solids under test conditions, and a working RO membrane does remove lead in practice. But the maker chose not to pay for the lead test, so nobody independent has checked that claim on that unit. We list what the certificate lists.

Countertop without the RO: two certified carbon units

If your water report shows lead but not nitrate, arsenic or fluoride, you may not need a membrane at all. Two countertop carbon units are certified for lead with no tank to refill and no waste water:

• Aquasana AQ-4000 · cartridge AQ-4035 · 450 gallons · WQA, NSF/ANSI 53: asbestos, cyst, lead, mercury, MTBE, PFOA, PFOS, turbidity, VOC. Connects to the tap with a diverter; no cabinet work.
• Brita Hub · 87340, 87341, 87344 (and the C variants) · cartridge CT01 · 120 gallons · WQA, NSF/ANSI 53: lead, mercury. Plug-in dispenser, no tap connection.

What renting changes about the math

• No install cost, no landlord conversation. An under-sink RO needs a hole in the counter and a saddle clamp on the drain; trade press puts a plumber's visit for a point-of-use install at roughly $150–$300 (This Old House, March 2026). Countertop: zero.
• You are the plumbing. You fill the tank, and the reject water collects in a tray or a second tank that you pour away. AquaTru lists 54 gallons a day of capacity; a family of seven drinks and cooks about 4 gallons a day, so capacity is not the issue — refilling is.
• Higher cost per gallon than under-sink. Smaller filters, replaced more often. Our worked figures are on what filtered water actually costs per gallon; put your own gallons and filter prices in the calculator.
• It moves with you. A countertop unit goes to the next apartment; an $849 under-sink unit (the one on our RO page) stays with the next tenant.
• RO strips minerals. Observational studies link magnesium-rich water to fewer heart deaths; Germany's risk agency found no harm from low-mineral water with a normal diet. Remineralising is optional. Bluevua's mineral filter is on its listing; AquaTru sells an alkaline cartridge separately.

We did not re-read unit and filter prices for this page on 27 October 2026; prices move weekly on these units. The calculator takes whatever price you see today.

Check any unit yourself in two minutes

1. Find the exact model number (AT2000, RO100ROPOT-Lite, WD-K19-S-US…).
2. Search it on IAPMO R&T, WQA or NSF.
3. Under NSF/ANSI 58, read the reduction claims next to the model. "TDS" alone means TDS alone.
4. For PFAS, look for a second listing under NSF/ANSI 53 with "PFOA/PFOS" or "Total PFAS".

Disclosure

No link on this site earns us anything: we use plain links to the retailer, no affiliate links. This page has no affiliate links. Whether a unit is on the list depends only on the certifier's listing.