NSF Product and Service Listings
These NSF Official Listings are current as of Wednesday, June 3, 2026 at 12:15 a.m. Eastern Time. Please contact NSF to confirm the status of any Listing, report errors, or make suggestions.
Alert: NSF is concerned about fraudulent downloading and manipulation of website text. Always confirm this information by clicking on the below link for the most accurate information: http://info.nsf.org/Certified/DWTU/Listings.asp?CompanyName=A%2EO%2E+Smith&
Note: Certain claims, such as Arsenic (Pentavalent) Reduction, appear as active links, allowing you to access additional information regarding the specific contaminants.
NSF/ANSI 42
Drinking Water Treatment Units - Aesthetic Effects
Drinking Water Treatment Units - Aesthetic Effects
| A.O. Smith Corporation | |
| 11270 West Park Place | |
| Milwaukee, WI 53224 | |
| United States | |
| 877-333-7106 |
Facility : # 1 Taiwan
| Replacement | Service Cycle | Flow Rate | ||||
| Brand Name / Trade Name / Model | Element | (gallons) | (gpm) | Claim | ||
|
Plumbed-In[Pb] |
||||||
| AO-IM | AO-IM | 2500 | .5 | Chlorine Reduction Taste and Odor Reduction |
||
| AO-MF-B | AO-MF-B-R | 2000 | 2 | Chlorine Reduction Taste and Odor Reduction |
||
|
  [Pb] Product also evaluated and determined to possess weighted average lead content of
<=0.25% and complies with lead content requirements for “lead free” plumbing as defined
by California, Vermont, Maryland, and Louisiana state laws and the U.S. Safe Drinking
Water Act.
|
||||||
|
Point-of-Entry [Pb] [POE] |
||||||
| AO-WH-PREV | AO-WH-PREV-R2 | (1) | 6 | Nominal Particulate Reduction, Class V | ||
|
  (1) Claims of capacity or rated service cycle are not applicable for mechanical filtration.
[Pb] Product also evaluated and determined to possess weighted average lead content of
<=0.25% and complies with lead content requirements for “lead free” plumbing as defined
by California, Vermont, Maryland, and Louisiana state laws and the U.S. Safe Drinking
Water Act.
[POE] Product conforms to NSF/ANSI/CAN 61 health effects requirements.
|
||||||
|
COMPONENTS: Filter Cartridges[1] |
||||||
| AO-WH-PRE-RC2 | ||||||
| AO-WH-PRE-RCP2[Pb] | ||||||
| AO-WH-PRE-RP2[Pb] | ||||||
| AO-WH-PREL-R[Pb] | ||||||
| AO-WH-PREL-RP[Pb] | ||||||
|
  [1] Conforms to material requirements only.
[Pb] Product also evaluated and determined to possess weighted average lead content of
<=0.25% and complies with lead content requirements for “lead free” plumbing as defined
by California, Vermont, Maryland, and Louisiana state laws and the U.S. Safe Drinking
Water Act.
|
||||||
|
COMPONENTS: Filter Cartridges, Point-of-Entry[1] [POE] |
||||||
| AO-WH-PREL-RC | ||||||
|
  [1] Conforms to material requirements only. [POE] Product conforms to NSF/ANSI/CAN 61 health effects requirements. |
||||||
|
COMPONENTS: Filter Housings[2] [Pb] |
||||||
| AO-WH-PREL | ||||||
| AO-WHE-PRE | ||||||
|
  [2] Conforms to the material and structural integrity requirements only.
[Pb] Product also evaluated and determined to possess weighted average lead content of
<=0.25% and complies with lead content requirements for “lead free” plumbing as defined
by California, Vermont, Maryland, and Louisiana state laws and the U.S. Safe Drinking
Water Act.
|
||||||
| A.O. Smith Corporation | |
| 11270 West Park Place | |
| Milwaukee, WI 53224 | |
| United States | |
| 800-527-1953 |
Facility : Haltom City, TX
| Replacement | Service Cycle | Flow Rate | ||||
| Brand Name / Trade Name / Model | Element | (gallons) | (gpm) | Claim | ||
|
Point-of-Entry[POE] |
||||||
| AO-WH-FILTER | AO-WH-FILTER-R | 600,000 | 7 | Chlorine Reduction Taste and Odor Reduction |
||
|
  [POE] Product conforms to NSF/ANSI/CAN 61 health effects requirements. |
||||||
NSF/ANSI 44
Cation Exchange Water Softeners
Cation Exchange Water Softeners
| A. O. Smith Corporation | |
| 11270 West Park Place | |
| Milwaukee, WI 53224 | |
| United States | |
| 414-359-4290 |
Facility : Groveport, OH
| Flow Rate | ||||||
| Brand Name / Trade Name / Model | (gpm) | Claim | ||||
|
Point-of-Entry [POE] |
||||||
| AO-WH-SOFT-350[1] | 7.5 | Barium Reduction Efficiency Rated[ER] Hardness Reduction[HR] Radium 226/228 Reduction |
||||
| AO-WH-SOFT-400T[1] | 8 | Barium Reduction Efficiency Rated[ER] Hardness Reduction[HR] Radium 226/228 Reduction |
||||
| AO-WH-SOFT-450T[1] | 8 | Barium Reduction Efficiency Rated[ER] Hardness Reduction[HR] Radium 226/228 Reduction |
||||
| AO-WH-SOFT-PRO-300[1] | 9.1 | Barium Reduction Efficiency Rated[ER] Hardness Reduction[HR] Radium 226/228 Reduction |
||||
| AO-WH-SOFT-PRO-500[1] | 7 | Barium Reduction Efficiency Rated[ER] Hardness Reduction[HR] Radium 226/228 Reduction |
||||
| AOW-S400[1] | 7.5 | Barium Reduction Efficiency Rated[ER] Hardness Reduction[HR] Radium 226/228 Reduction |
||||
| AOW-S500[1] | 7 | Barium Reduction Efficiency Rated[ER] Hardness Reduction[HR] Radium 226/228 Reduction |
||||
|
  [1] Product evaluated and determined to comply with efficiency rating requirements defined by
[ER] Softener Efficiency indicates that the softener achieves a minimum of 3,350 grains of
hardness removed per pound of regenerant salt (477 grams of hardness removed per
kilogram of regenerant salt), and also that it uses 5 gallons or less of regenerant
water per 1,000 grains of hardness removed (18.9 liters or less of regenerant water per
64.8 grams of hardness removed).
[HR] Hardness Reduction indicates that the published capacity ratings for reducing hardness
have been verified.
[POE] Product conforms to NSF/ANSI/CAN 61 health effects requirements.
|
||||||
NSF/ANSI 58
Reverse Osmosis Drinking Water Treatment Systems
Reverse Osmosis Drinking Water Treatment Systems
| A.O. Smith Su Teknolojileri A.S. | |
| Ikitelli O.S.B.Mh.Marmara D Blok Sk. | |
| No:2-3, Küçükçekmece-Ikitelli | |
| 34303 Istanbul | |
| Turkey | |
| 90 212 444 1646 | |
| Visit this company's website |
Facility : # 3 China
|
COMPONENTS: RO Membrane[1] [2] |
||||||
| RO-1812-50 | ||||||
| RO-1812-75 | ||||||
| RO-2012-100 | ||||||
| RO-2012-150 | ||||||
| RO-2812-200 | ||||||
| RO-3012-300 | ||||||
| RO-3012-400 | ||||||
|
  [1] Certified to Standard 58, material requirements only. At temperatures below 45°C, pH
value 3 ~ 8, flushing at least 48 hours.
[2] TF-XXYY-ZZ
XX - Membrane element diameter in inches
18 - 1.8"
20 - 2.0"
28 - 2.8"
30 - 3.0"
YY - Membrane element length in inches (12")
ZZ - Permeated flow in gallons per day (GPD) (50, 75, 100, 150, 200, 300 or 400)
|
||||||
| A.O. Smith Water Treatment (North American), Inc. | |
| 1900 Prospect Court | |
| Appleton, WI 54914 | |
| United States | |
| 800-777-1426 | |
| 920-739-9401 |
Facility : # 1 USA
| Replacement | Daily Production | |||||
| Brand Name / Trade Name / Model | Module | Rate (gpd) | Claim | |||
|
Plumbed-In to Separate Tap [Pb] |
||||||
| AORO-50 | S1448RS | 11 | Arsenic (Pentavalent)<=300 ppb Reduction* Barium Reduction Cadmium Reduction Chromium (Hexavalent) Reduction Chromium (Trivalent) Reduction Copper Reduction Fluoride Reduction Lead Reduction Nitrate/Nitrite Reduction Radium 226/228 Reduction Selenium Reduction TDS Reduction |
|||
|
  * This product is intended for use only on water supplies that have been shown to be at or
below the referenced concentration and valency of arsenic.
[Pb] Product also evaluated and determined to possess weighted average lead content of
<=0.25% and complies with lead content requirements for “lead free” plumbing as defined
by California, Vermont, Maryland, and Louisiana state laws and the U.S. Safe Drinking
Water Act.
|
||||||
CSA Standard B483.1
Drinking Water Treatment Systems
Drinking Water Treatment Systems
| A. O. Smith Corporation | |
| 11270 West Park Place | |
| Milwaukee, WI 53224 | |
| United States | |
| 414-359-4290 |
Facility : Groveport, OH
| Flow Rate | ||||||
| Brand Name / Trade Name / Model | (gpm) | Claim | ||||
|
Point-of-Entry [POE] |
||||||
| AO-WH-SOFT-PRO-300[1] | 9.1 | Barium Reduction Efficiency Rated[ER] Hardness Reduction[HR] Radium 226/228 Reduction |
||||
| AOW-S400[1] | 7.5 | Barium Reduction Efficiency Rated[ER] Hardness Reduction[HR] Radium 226/228 Reduction |
||||
| AOW-S500[1] | 7 | Barium Reduction Efficiency Rated[ER] Hardness Reduction[HR] Radium 226/228 Reduction |
||||
|
  [1] Product evaluated and determined to comply with efficiency rating requirements defined
by California state laws.
[ER] Softener Efficiency indicates that the softener achieves a minimum of 3,350 grains of
hardness removed per pound of regenerant salt (477 grams of hardness removed per
kilogram of regenerant salt), and also that it uses 5 gallons or less of regenerant
water per 1,000 grains of hardness removed (18.9 liters or less of regenerant water per
64.8 grams of hardness removed).
[HR] Hardness Reduction indicates that the published capacity ratings for reducing hardness
have been verified.
[POE] Product conforms to NSF/ANSI 61 health effects requirements.
|
||||||
Number of matching Manufacturers is 6
Number of matching Products is 30
Processing time was 0 seconds

