Sources for Post Ranch Inn
Every line on the Post Ranch Inn record, with where it came from, what kind of source it is and the date we read it.
Back to the record- Current as of
- 19 Aug 2026
- Last reviewed
- 19 Aug 2026
- Strongest evidence
- Specified
- Coverage
- Documented across 8 of 8 pathways.
Practical details and location
The practical details and the map point, 36.2303, -121.7717
The property’s own website
The property's own site: its name and its place are on the page
Safely managed drinking water, USA, 2024: The World Health Organization reports 98 per cent of the population nationally, 98 per cent in urban areas using a safely managed drinking water service. This describes the country, not this property, and says nothing about what reaches a guest room here. It is recorded because it is the background against which a property's own treatment is worth publishing.
Regional data is context about the location. It does not establish conditions inside a room.
Ambient PM2.5 and PM10 near Big Sur, California, USA, 30 days to 2026-08-17: Modelled ambient air over this location averaged 42.9 micrograms per cubic metre of PM2.5 and 45.9 of PM10 across the 720 hours to 2026-08-17, peaking at 601.6 PM2.5. The World Health Organization annual guideline for PM2.5 is 5. This is the outdoor air over the area, modelled rather than measured on site, and it is not a reading of the air inside any room.
Regional data is context about the location. It does not establish conditions inside a room.
Evidence by area
All eight areas, in the order this index reads them. Every line was read and placed by a person.
Air Ecology
Filtration in public spaces is published as HEPA, which is itself a defined efficiency classification. The specific class is not stated, and no filtration is described for guest rooms.
In their words: “HEPA air filters are used in all public spaces.”
The property states it runs an indoor air quality management plan including maintenance and monitoring and retains an indoor air quality adviser, with no method, standard or reading published.
In their words: “The property implements an indoor air quality management plan to ensure guests' well-being, including maintenance and monitoring. In addition, Post Ranch has retained an indoor air quality expert, who advises Post Ranch on the many ways to maximize fresh air in the rooms and throughout all indoor public spaces.”
The property maintains a published indoor air quality management plan with HEPA filtration named for all public spaces.
In their words: “The property maintains a full indoor air quality management plan with HEPA filtration in all public spaces”
Read it: The non-toxic hotels that are actually worth it Archived copy
Water Integrity
All water is drawn and treated from seven wells on the property, with usage measured daily and quality tested weekly, and no contaminant panel, laboratory or result published.
In their words: “All water used at Post Ranch Inn is sourced and treated via the seven wells located on property. That includes drinking water, water used in guestrooms, Sierra Mar, maintenance, laundry, etc. Usage is measured daily and quality is monitored and tested weekly.”
The property publishes that it created the first commercial greywater system approved in Monterey County, with no treatment train or output specification published.
In their words: “Post Ranch Inn created the first commercial greywater system approved in Monterey County.”
Drinking water reaches guest rooms in refillable glass bottles rather than single use plastic, with no room level filtration described.
In their words: “Refillable glass water bottles are used in lieu of plastic.”
Light Rhythm
Tree House rooms are published as having a skylight positioned over the bed.
In their words: “Plus, add some extra magic to your evenings by doing a little star gazing through the skylight over the bed.”
South facing guestroom windows are tinted and ocean facing windows carry a protective film, with no glazing specification or light transmittance published.
In their words: “South-facing windows in guestrooms have been tinted to lower energy use. A protective film has been placed on ocean-facing windows to reduce the sun's harmful effects, maintain room comfort, and save energy.”
Lighting throughout the property is described as LED and low voltage, with no colour temperature, tunability or flicker performance published.
In their words: “LED and low-voltage lighting are used throughout the property.”
EMF Harmony
Not published. We looked and found nothing on this, which is a gap in what we could read, not a finding about the building.
Materials and Textiles
The property announced in 2020 that daily cleaning uses ACT.Global ECA Water, an electrically activated salt and water solution produced on site, which the announcement identifies as the EPA registered disinfectant Annihilyte-1, number 92449-1. That registration is held by Annihilare Medical Systems and certifies the product as sold, not anything measured at this property.
In their words: “The second step, which ACT.Global refers to as ECA Water, follows CDC guidelines, is Green Seal approved, and is an EPA-registered disinfectant under the name Annihilyte-1 (#92449-1).”
Read it: Big Sur's Post Ranch Inn Announces Non-Toxic, Sustainable Hygiene Solution And A More Holistic Approach To Hospitality (self-issued release, 28 July 2020, distributed by PR Newswire) Archived copy
The property announced in 2020 that indoor surfaces exposed to light were treated with ACT CleanCoat, a photocatalytic coating the announcement states holds for twelve months after application. No surface or air test result is published for the property, and no reapplication since 2020 is published.
In their words: “The first step of Premium Purity is to apply the non-toxic ACT CleanCoat to ALL indoor surfaces exposed to light, rendering them self-disinfecting through photocatalysis, which decomposes microorganisms including bacteria, molds, and viruses, as well as VOCs, resulting in anti-microbial surfaces and cleaner air for 12 months after initial application.”
Read it: Big Sur's Post Ranch Inn Announces Non-Toxic, Sustainable Hygiene Solution And A More Holistic Approach To Hospitality (self-issued release, 28 July 2020, distributed by PR Newswire) Archived copy
Adhesives, paints, coatings and carpeting are described as low emitting, with no product, brand or emissions standard named and no VOC limit published.
In their words: “Post Ranch uses low-emitting materials to reduce indoor air contaminants' amount, including adhesives, paints, coatings, and carpeting.”
Guestroom walls use reclaimed wood, including old growth redwood taken from wine casks.
In their words: “Reclaimed wood, including old-growth redwood from old wine casks, adds a rich, deep red color to many guestroom walls.”
Sheets and towels are stated to be custom made without harmful chemicals or dyes, with no fibre content, supplier or certification named.
In their words: “Sheets and towels are custom-made, using no harmful chemicals or dyes.”
Room feature lists describe the bed as carrying an organic mattress, with no brand, fill, certification or flame retardant treatment published.
In their words: “King bed with organic mattress”
Laundry detergent is described as biodegradable and hypoallergenic with botanical ingredients, with no product named.
In their words: “Laundry detergent is biodegradable and hypoallergenic, with botanicals and active herbal ingredients.”
Materials are named through the guest spaces: zero and low-VOC paints throughout, 600-thread-count organic cotton bedding, 100 percent natural latex mattresses, and Coyuchi organic cotton as the bedding standard.
In their words: “bedding made of 600-thread-count organic cotton, mattresses that are 100% natural latex... uses zero-VOC and low-VOC paints throughout”
The housekeeping chemistry is named: Post Ranch is reported as the first US hotel to adopt the Premium Purity non-toxic cleaning system.
In their words: “Post Ranch was the first hotel in the US to adopt a Premium Purity non-toxic cleaning system”
The Girls Who Eat Gold Star rating this property holds is defined to require no synthetic fragrance in main spaces or beauty products; the definition is the publisher's, recorded at the tier a third-party assertion earns.
In their words: “Best-in-class properties meeting 4+ of our standards, with no synthetic fragrance in main spaces or beauty products, and verified non-toxic practices across areas like air quality, cleaning products, food sourcing, and bedding”
Read it: The non-toxic hotels that are actually worth it Archived copy
Food and Kitchen
An on site Chefs' Garden supplies produce, vegetables and herbs to the kitchen, with no share of total supply published.
In their words: “The on-site Chefs' Garden provides fresh produce, vegetables, and herbs for our guests to enjoy.”
The restaurant states it serves free range beef and poultry and organic seasonal vegetables and fruit, with no supplier list, certifier or verified share published.
In their words: “Post Ranch's award-winning restaurant Sierra Mar supports small producers and the regional economy by serving all-natural free-range beef and poultry and fresh, on-site, or locally-grown seasonal organic vegetables and fruit.”
The kitchen's fats are named to producer: local extra virgin olive oil including Corto Olive from Lodi and a small-batch Palo Colorado oil from Big Sur.
In their words: “The kitchen cooks in premium local extra-virgin olive oil, including Corto Olive from Lodi and a small-batch Palo Colorado olive oil from Big Sur”
Biophilic and Healing Design
Ocean Houses are earth sheltered with sod roofs and Tree Houses are raised on nine foot stilts to avoid the root balls of nearby redwood and oak trees.
In their words: “The earth-sheltered Ocean Houses with sod roofs blend into the landscape and reduce heat loss. The stilted 9 ft. Tree Houses were designed to protect the fragile root balls of nearby redwood and oak trees.”
The property publishes the design intent behind its architecture, attributing the organic architecture approach to Mickey Muennig.
In their words: “Mickey's revolutionary innovative design utilized organic architecture intending for guests to feel a part of nature, not just observers of it.”
Ocean House rooms are freestanding structures with curved living roofs planted with grass and wildflowers and outward ocean views.
In their words: “Become one with nature with these freestanding rooms, offering curved, living roofs covered with grass and wildflowers, along with panoramic ocean views.”
Landscaping is described as native and drought tolerant planting tended with organic fertiliser, with no species palette published.
In their words: “Water-efficient landscaping is used, focusing on native and drought-tolerant plants that are tended with organic fertilizer.”
Sound and Sensory Ecology
Not published. We looked and found nothing on this, which is a gap in what we could read, not a finding about the building.
Certifications
Beyond Green, issued by Beyond Green, Preferred Travel Group
Awarded: Not stated. Valid until: Not stated.
Girls Who Eat Gold Star rating, issued by Girls Who Eat, Non-Toxic Travel Made Simple
Awarded: Not stated. Valid until: Not stated.
Disclosures
Compare what each stay offers, how it was checked and what still needs confirming. Assessment labels describe the review, not an overall quality rating.
A low score means a property has not published information. It does not mean the property is unsafe, unhealthy or poorly run.
A score describes proof: what a stay publishes and, on a Human Garage certified stay, what our assessor checked in person. It is not a quality rating of the property. Listings are free, and any commercial relationship is disclosed.