Which Water Filter Fits My LG Refrigerator? (LT1000P, LT700P, LT800P)

Most LG refrigerators made since 2017 use the LT1000P. If your fridge is older, you likely need the LT700P, the LT800P, or one of the legacy LT500P/LT600P cartridges. The honest answer to “which water filter fits my LG refrigerator” is short: these filters are not interchangeable, so you have to match the part, not guess from the brand.

This guide names each LG filter, what it is certified to remove, and which one matches your fridge. The one rule on every fit claim here applies to you, too: confirm the model printed on your current filter or in your manual first. One fridge line can use different filters across model years, and a cartridge that is one millimeter off in its housing will not seat or seal.

The Fast Answer: Match the Part, Not the Brand

LG sells its filters under short “LT” marketing names and longer “ADQ” manufacturing part numbers. They are the same cartridge. The LT1000P is also stamped ADQ74793501. When you shop, either number is valid, but the printed part on your old filter is the source of truth.

Here is the current LG lineup at a glance:

• LT1000P (ADQ74793501) – the standard filter for most LG French-door refrigerators sold since 2017. The only LG cartridge certified to NSF/ANSI 42, 53, and 401.
• LT700P (ADQ36006101) – the most widely used LG filter across the prior generation. Certified to NSF/ANSI 42 and 53.
• LT800P (ADQ73613401) – select side-by-side and French-door models. Certified to NSF/ANSI 42 and 53.
• LT500P (5231JA2002A) and LT600P – legacy cartridges for older LG and Kenmore-by-LG units.
• LT120F (ADQ73214404) – this is an air filter, not a water filter. More on that trap below.

The most reliable check is the part number printed on the side of your current filter, or the model number on the inside-door sticker of the refrigerator. LG also publishes a filter finder keyed to your refrigerator model number. If you would rather not dig through three numbers, our which-filter-fits finder walks you to the right cartridge from your fridge model.

LT1000P: The Current Standard (and the Only NSF 401 LG Filter)

If you own an LG fridge with an interior water and ice dispenser made in roughly the last several years, there is a strong chance the LT1000P is your cartridge. It is rated for 200 gallons or six months, whichever comes first, and replacement takes a quarter-turn – no tools.

What sets the LT1000P apart is its certification depth. LG lists it as certified to NSF/ANSI 42, 53, and 401. In plain terms:

• NSF/ANSI 42 covers aesthetic effects – chlorine taste and odor. This is the comfort claim.
• NSF/ANSI 53 covers health effects – it is the standard behind reductions of contaminants like lead, cysts, asbestos, and mercury.
• NSF/ANSI 401 covers emerging contaminants – a class that includes certain pharmaceuticals and pesticides that most refrigerator filters never test for.

The LT1000P is the only LG OEM cartridge carrying all three. To support that broader profile it uses a denser carbon block. According to LG’s product page, the part also ships under the numbers AGF80300704 and AGF80300705, plus combo packs like the LT1000PC that bundle the air filter. Same water cartridge inside.

Honest trade-off: NSF 401 is a real and uncommon credential, but it does not make this filter a reverse-osmosis system. It reduces specific listed contaminants; it does not desalinate, and it will not touch dissolved minerals that cause hard-water scale. If your goal is whole-home contaminant removal, a fridge filter is the wrong tool – price out a point-of-use system with our reverse osmosis cost calculator.

LT700P and LT800P: The Prior Generation

The LT700P is the workhorse of the previous LG generation – the single most common filter across that era’s French-door and bottom-freezer models. It carries part numbers including ADQ36006101 and ADQ36006113, is rated 200 gallons / six months, and is certified to NSF/ANSI 42 and 53. Compatible refrigerator models include lines such as LFX25974, LFX28979, LFX31995, and LFXS30766.

The LT800P (ADQ73613401, also ADQ73613408) serves select side-by-side and French-door models – think families like LSXS26326 and LMXS30776. It is also rated 200 gallons / six months and certified to NSF/ANSI 42 and 53.

Notice what is the same and what is not. The LT700P and LT800P share the same headline NSF certifications (42 and 53) and the same rated capacity. What differs is the housing and mounting – the physical shape that decides whether the cartridge seats and seals in your fridge. That is exactly why you cannot swap an LT700P for an LT800P even though their spec sheets read alike. Fit is mechanical, not just chemical.

Neither of these is certified to NSF/ANSI 401. If emerging-contaminant reduction matters to you and your fridge is on the older platform, that capability is one reason buyers upgrade hardware to a current LT1000P-compatible model – but only if your refrigerator actually accepts the newer cartridge. Check the manual; do not assume.

LT500P, LT600P, and the Kenmore-by-LG Crossover

Older LG units – and many Kenmore refrigerators that LG built under contract – use the legacy LT500P and LT600P cartridges. These predate the NSF 401 era and the current housing design.

• LT500P is also stamped 5231JA2002A (and ADQ72910911). It cross-references to Kenmore 46-9890 / 9890, plus older codes like 46-9690 and 46-9490.
• LT600P cross-references to Kenmore 46-9990 / 9990.

The Kenmore crossover trips up a lot of people. A Kenmore-branded fridge built by LG takes the LG-equivalent cartridge, but Kenmore prints its own 4-digit number (the “9890” or “9990” family) rather than the LG “LT” name. Match the Kenmore number to the LG equivalent, or read the part directly off your old filter. When in doubt, the printed part wins over any chart – including this one.

These legacy filters still reduce chlorine taste and odor and carry health-effect certifications appropriate to their listing, but they are an older generation. If yours is getting hard to source, that scarcity is a signal your refrigerator is aging, not a reason to fit a cartridge that was never designed for it.

The LT120F Trap: That Round One Is an Air Filter

Here is the single most common LG filter mistake: buying the LT120F thinking it cleans your water. It does not. The LT120F (ADQ73214404) is a refrigerator air filter – a small puck mounted at the back wall, above the top shelf, that circulates and deodorizes the air inside the cabinet. It never touches the water line.

Many LG fridges use both: a water cartridge for the dispenser and ice, and the LT120F air filter for odor. They are sold together in bundles like the LT1000PC, which is probably why they get confused. If your water tastes off, the LT120F will do nothing for it – you want your LT1000P, LT700P, LT800P, or legacy cartridge instead. If your fridge smells musty, the air filter is the right part. Two different jobs, two different filters.

How to Confirm the Exact Fit Before You Buy

Run these three checks in order, and stop at the first one that gives a clear answer:

1. Read your current filter. The LG “LT” name or the ADQ/5231JA part number is printed on the cartridge body. This is the most reliable source.
2. Check the inside-door sticker. Your refrigerator’s model number lives on a label inside the fresh-food door. Feed it to LG’s filter finder or to our finder.
3. Verify any health claim at the source. If you are buying aftermarket and a lead-reduction (NSF 53) claim is what you care about, confirm that the exact filter SKU is listed – not just “compatible.” Aftermarket NSF 53 is SKU-specific. Search the brand and model at info.nsf.org before you trust a lead claim.

A note on water quality testing: a fridge filter improves the water at one tap. It does not tell you what is in your supply – for a municipal baseline, read your utility’s annual Consumer Confidence Report. If you are on a private well or want to know your baseline, the EPA’s guidance on drinking water explains which contaminants to test for and why. And if your real problem is scale and hard water, no refrigerator cartridge addresses it – size a softener with our water softener sizing calculator instead.

The Bottom Line

For most current LG refrigerators, the answer is the LT1000P – and it is the only LG cartridge certified to NSF 42, 53, and 401. Older fridges take the LT700P or LT800P; legacy and Kenmore-by-LG units take the LT500P or LT600P. The LT120F is an air filter and belongs in a different conversation entirely.

Whatever the chart says, the part printed on your current filter or in your manual is the final word. Confirm it first, verify any health claim at info.nsf.org, and you will buy the right cartridge once instead of twice.

This guide is a reference, not a sales page. Specifications and certifications come from LG’s published product pages and NSF; verify the exact part and listing for your refrigerator before purchase.