Our Wet Mills (Factories)

From the Highlands of Kiambu to Your Cup — Coffee Grown with Purpose

Factories

Komothai Coffee Growers Cooperative Society operates 13 wet mills (also known as factories) across the lush highlands of Kiambu and Lari, Kenya. Each mill is an essential pillar in the farm-to-cup journey, processing cherry from local smallholder farmers and upholding Komothai’s legacy of producing premium, fully washed Arabica coffee.

Strategically spread across upper, middle, and lower agro-ecological zones, these mills reflect a diverse tapestry of altitudes, microclimates, water sources, and soil types—contributing to a rich range of cup profiles that define Komothai’s reputation in both local and global markets.

Komothai Wet Mills Overview

#	Factory	Year	Ward / Constituency	Zone	Water Source	Altitude (masl)	Notes
1	Riakahara	1960	Ngewa, Githunguri	Middle	Gatamaiyu River	~1,750	Founding factory; excellent infrastructure and legacy location.
2	Gathiruini	1962	Komothai, Githunguri	Upper	Komothai River	~1,830	Cool temperatures favor slow cherry development.
3	Barikongo	1964	Komothai, Githunguri	Lower	Komothai River	~1,720	Strong community ties; consistent cherry quality.
4	Korokoro	1966	Komothai, Githunguri	Lower	Komothai River	~1,700	Efficient pulping and drying system ensures clarity in cup.
5	Kagwanja	Kagwanja	Komothai, Githunguri	Middle	Komothai River	~1,750	Balanced microclimate; known for smooth-bodied coffees.
6	Kirura	1970	Komothai, Githunguri	Upper	Komothai River	~1,820	High-altitude site with excellent varietal diversity
7	Githongo	1972	Kiambururu, Lari	Upper	Gatamaiyu River	~1,900	Elevated location; ideal for clean, citric cup profiles.
8	Thiururi	1974	Ngewa, Githunguri	Middle	Gatamaiyu River	~1,780	Balanced coffees with floral and sweet notes
9	Kaimbu	1976	Komothai, Githunguri	Middle	Komothai River	~1,750	Known for round body and mild acidity.
10	New Thuita	1978	Komothai, Githunguri	Lower	Komothai River	~1,710	Strong productivity; consistent fermentation.
11	Kanake	1980	Komothai/Kiambururu, Githunguri/Lari	Upper	Kanake & Gatabiriria Rivers	~2,100	Highest elevation; yields complex and floral coffees.
12	Gatuyu	1984	Komothai, Githunguri	Lower	Komothai River	~1,710	Excellent cherry reception system.
13	Kamuchege	1987	Kiambururu, Lari	Upper	Lagoon from Gatugu Stream	~1,960	Unique lagoon-fed system; preserves juicy acidity.

Growing Regions & Unique Terroir

Soils & Varieties

All Komothai factories sit on fertile red volcanic soils, rich in organic matter and ideal for coffee production. Farmers cultivate:

Altitude & Climate

With elevations ranging from ~1,700 to 2,100+, Komothai mills benefit from cooler temperatures, which slow cherry maturation, increase sugar concentration, and enhance complexity. Higher zones often yield vibrant acidity and floral tones, while middle and lower zones deliver full-bodied, fruit-forward profiles.

Reliable Water Sources

Each wet mill is located next to a natural river, stream, or lagoon, which provides essential clean water for fully washed coffee processing. This ensures consistent fermentation, thorough washing, and even drying—all key to preserving clarity and quality in the cup.

Highlights from Selected Wet Mills

Lower Zone Highlights

Barikongo (1964)

A reliable performer in Komothai’s lower zone, Barikongo serves a dedicated group of farmers and delivers coffees with mild acidity, rich body, and sweet stone-fruit notes. The proximity to Komothai River ensures year-round water availability for efficient washing and soaking.

Korokoro (1966)

Located just downstream from Barikongo, Korokoro is known for clean cup clarity and consistency, thanks to well-maintained pulping facilities and proper drying beds. Expect smooth-bodied coffees with chocolate and raisin tones.

Middle Zone Highlights

Kagwanja (1968)

Strategically positioned at mid-elevation, Kagwanja produces coffees with balanced structure, moderate acidity, and a nutty finish. The steady microclimate helps maintain even drying and fermentation conditions.

Riakahara (1960)

As Komothai’s first and oldest factory, Riakahara stands out for its historical legacy and strong community engagement. Coffees from Riakahara offer a rounded cup with caramel sweetness and red fruit accents.

Upper Zone Highlights

Kirura (1970)

Nestled in Komothai’s upper zone, Kirura benefits from higher altitude and cooler night temperatures. Its coffees are distinguished by floral aromatics, bright citrus acidity, and crisp finish—perfect for premium microlots.

Kamuchege (1987)

The only Komothai mill that uses a natural lagoon formed by the Gatugu Stream. This unique water source and high altitude produce coffees with juicy body, lively acidity, and complex tropical fruit notes.

Final Note

Komothai’s 13 wet mills represent more than just processing sites—they symbolize the cooperative’s commitment to quality, traceability, and community development. Powered by the dedication of over 11,000 smallholder farmers, including more than 5,200 women, these mills form the heartbeat of Komothai’s operations.

From the legacy-rich Riakahara to the mist-kissed heights of Kanake, each factory contributes to the unmistakable identity of Komothai coffee—distinctive, dependable, and deeply rooted in the Kenyan highlands.