Beer — Lager Bohemia · Czech Republic · BJCP 3B High Confidence

Czech Pilsner

Bohemian Pilsner — invented 5 October 1842 in Plzeň by a Bavarian brewer named Josef Groll. The world's most copied beer style. The original.

✓ Verified against BJCP 2021 Category 3B · Plzeňský Prazdroj records · Czech Beer and Malt Association · Reinheitsgebot inapplicability (Czech tradition) · Last verified May 2026

BJCP 2021 Definition — Category 3B: Czech Premium Pale Lager

Czech Premium Pale Lager (BJCP 3B): A refreshing, hoppy, crisp lager. Rich, complex malt flavour and a soft, round bitterness from Saaz hops. Colour 3.5–6 SRM (pale gold). OG 1.044–1.056. ABV 4.2–5.8%. IBU 30–45. Fermented with Bohemian lager yeast at cold temperatures; lagered 6–12 weeks. Soft water (low mineral content) essential. The defining example is Pilsner Urquell, brewed at Plzeňský Prazdroj since 1842.

— BJCP 2021 Beer Style Guidelines, Category 3B; Plzeňský Prazdroj a.s., U Prazdroje 7, 301 00 Plzeň, Czech Republic

What is Czech Pilsner?

Czech Pilsner — more formally, Bohemian Pilsner or Czech Premium Pale Lager — is the beer style that changed the world. Before 1842, virtually all European beer was dark: amber, brown, or black. After 1842, the world's beer shifted toward pale golden lager, and the transformation happened in a single night, in a single brewery, in the Bohemian city of Plzeň.

On 5 October 1842, the newly built Měšťanský pivovar (Citizens' Brewery, now Plzeňský Prazdroj) tapped its first batch of a new beer made by Bavarian brewer Josef Groll. The beer was clear, golden, and sparkling — unlike anything seen before in a beer glass. The combination of the pale malt technology recently developed in England, the local soft water of Plzeň, the aromatic Saaz hops from nearby Žatec, and Groll's cold-fermentation technique produced a beer of such brightness, freshness, and clean flavour that it rapidly spread across Europe and then the world.

Why Plzeň specifically — the water

The water of Plzeň is exceptionally soft — among the softest brewing water in the world, with very low mineral content (total dissolved solids typically under 50 mg/L). Soft water is ideal for hop-forward, delicate pale lagers because hard water with high sulfate content would make Saaz hops' noble bitterness harsh and aggressive. Plzeň's water makes the bitterness smooth and round. This is not coincidence — it is the reason that Pilsner style was invented in Plzeň rather than Munich, Vienna, or Prague, where water chemistry is harder. When brewers elsewhere try to replicate Czech Pilsner, their first step is typically to dilute or soften their water to approximate Plzeň's chemistry.

What does it taste like?

Czech Premium Pale Lager (Pilsner Urquell style) is pale gold with a brilliant clarity, a dense white foam, and a spritzy carbonation. The aroma combines freshly baked bread or biscuit malt with the distinctive herbal, slightly spicy, and floral character of Saaz hops — one of the world's most distinctive hop aromas. The palate has a rounded, velvety body (partly from the decoction mashing method, partly from extended lagering), a clean malt character, and a soft but assertive bitterness that is firm without being harsh. The finish is dry, clean, and refreshing.

There is also a sub-style: Czech Pale Lager (BJCP 3A) at lower strength (3.5–4.0% ABV) — the everyday session lager of Czech pub culture, consumed in extraordinary quantities at traditional Czech hospody (pubs) where fresh draught is drawn slowly into 0.5L glasses.

History and Josef Groll

Josef Groll (1813–1887) was a Bavarian brewer from Vilshofen an der Donau, Bavaria, hired specifically by the Měšťanský pivovar in Plzeň after the town's brewers had suffered years of producing undrinkable beer. The previous batch was of such poor quality that it was publicly destroyed by the town's brewers in front of the Town Hall in 1838 — a documented act of quality protest.

Groll brought with him: knowledge of cold-fermenting lager yeast (then closely guarded Bavarian technology); access to pale malt kilning techniques recently developed in Britain; and the skills to combine these with Plzeň's soft water and the local Saaz hops. The 1842 first brew succeeded beyond expectation.

The brewery was renamed Plzeňský Prazdroj (Pilsner Urquell in German — "original source of Pilsner") in 1898 to assert the authentic origin against the numerous imitators that had proliferated across Europe and America. Groll himself returned to Bavaria after a brief tenure in Plzeň and lived out his life in Vilshofen, reportedly knowing little of the global revolution he had initiated.

Plzeňský Prazdroj today is owned by Asahi Breweries (Japan) following its acquisition from SABMiller in 2017. The brewery remains at its historic site: U Prazdroje 7, 301 00 Plzeň, Czech Republic · prazdroj.cz · +420 377 062 888.

Saaz Hops — The Defining Botanical

Saaz (Czech: Žatec) hops are grown in the Žatec region of northwestern Bohemia and have been cultivated there since at least the 13th century. They are classified as "noble hops" — low alpha acid varieties producing fine, delicate bitterness and distinguished aromatic profiles. Saaz hops produce a specific aroma described as spicy, herbal, and slightly floral — with farnesene as a key aromatic compound alongside humulene and caryophyllene.

The Žatec hop-growing region has EU GI protection for "Žatecký Chmel" (Saaz Hops from Žatec). The Hop Research Institute (Chmelařský institut s.r.o.) at Kadaňská 2525, 438 01 Žatec, Czech Republic maintains the Saaz variety genetic resource programme and provides documentation of the variety's cultivation history.

Decoction Mashing — the Czech Pilsner Difference

Traditional Czech Pilsner uses a triple decoction mashing process — a technically demanding, time-consuming method that involves repeatedly removing a portion of the mash, boiling it separately, and returning it to the main mash to raise temperature in stages. This is more complex and costly than infusion mashing (used for most modern lagers and ales), but it produces a richer, more complex malt character — more body, more melanoidin complexity, a slightly fuller mouthfeel — that single-temperature infusion mash lagers lack.

Pilsner Urquell continues to use triple decoction mashing at its Plzeň brewery and this is considered a key differentiator of the authentic Czech Pilsner style from the thousands of "pilsner-style" beers brewed globally by modern simplified methods.

BJCP Parameters and Czech vs German Pilsner

Pilsner — Czech vs German Style Comparison (BJCP 2021)
Parameter	Czech Premium Pale (3B)	German Pils (5D)
Colour (SRM)	3.5–6 (pale gold)	2–5 (straw to pale gold)
ABV	4.2–5.8%	4.4–5.5%
IBU	30–45 (rounded, soft)	22–40 (crisp, assertive)
Malt character	Rich, complex — decoction mash	Lighter, cleaner
Bitterness character	Soft, rounded, velvety from soft water	Crisp, drier, more assertive
Water	Very soft (Plzeň: <50 mg/L TDS)	Moderate — varies by region
Hops	Saaz (Žatec) exclusively	Noble hops (Hallertau, Tettnang, Spalt)
Lagering	Minimum 6–12 weeks	Minimum 4–6 weeks
Defining example	Pilsner Urquell (Plzeňský Prazdroj, Plzeň)	Jever Pilsener, Bitburger, Warsteiner

Regulatory Framework and GI Status

Czech Pilsner differs from German Pilsner in a key regulatory respect: Czech beer is NOT subject to the Reinheitsgebot (German Purity Law). Czech brewing law permits adjuncts and additions that German law does not allow. In practice, authentic Czech Pilsner uses only barley malt, Saaz hops, water, and yeast — but this is tradition and quality choice, not legal requirement as it would be in Germany.

Plzeňský Prazdroj a.s. — U Prazdroje 7, 301 00 Plzeň, Czech Republic · prazdroj.cz · +420 377 062 888. Producer of Pilsner Urquell, Kozel, Gambrinus. Owned by Asahi Breweries, Japan (acquired from SABMiller, 2017).

Czech Beer and Malt Association (Český svaz pivovarů a sladoven) — Lípová 15, 120 44 Praha 2, Czech Republic · cspas.cz · +420 224 919 117. The industry body representing Czech brewers; maintains quality standards, production statistics, and the Czech beer culture documentation that underpins the UNESCO Intangible Cultural Heritage candidacy.

State Veterinary and Food Administration of the Czech Republic (SVÚZ / SZPI) — Kvítková 11, 760 01 Zlín · szpi.gov.cz. The Czech food safety authority responsible for beer quality and labelling standards.

Hop Research Institute (Chmelařský institut s.r.o.) — Kadaňská 2525, 438 01 Žatec, Czech Republic · chizatec.cz. Administers Saaz hop GI and maintains genetic resources for Žatecký Chmel.

Pilsner Urquell's "original source" claim

The name "Pilsner Urquell" (Czech: Plzeňský Prazdroj) translates as "original source of Pilsner." The EU GI for Pilsner Urquell as a brand is separate from any geographic protection for the word "Pilsner" or "Pils" as a style description — these terms have become generic internationally, which is why every country in the world can legally produce beer called "pilsner." The 1898 renaming was an attempt to assert authenticity against generification, not a legally effective GI claim for the style name itself.

Primary Sources

BJCP 2021 Beer Style Guidelines, Category 3B (Czech Premium Pale Lager) and 3A (Czech Pale Lager). bjcp.org. Technical parameters for the authentic Czech Pilsner style.

Plzeňský Prazdroj a.s. Historical documentation of the 5 October 1842 first brew and Josef Groll's role. U Prazdroje 7, 301 00 Plzeň. prazdroj.cz. +420 377 062 888.

Czech Beer and Malt Association (Český svaz pivovarů a sladoven). Lípová 15, 120 44 Praha 2. cspas.cz. +420 224 919 117. Czech beer production statistics and heritage documentation.

Hop Research Institute (Chmelařský institut s.r.o.). Kadaňská 2525, 438 01 Žatec. chizatec.cz. Saaz (Žatecký Chmel) GI documentation and variety genetics.

Narziss, L. and Back, W. (2012). Die Bierbrauerei. Wiley-VCH. Decoction mashing chemistry and Czech Pilsner technical parameters — authoritative German brewing reference.

This page documents historical and technical sources about Czech Pilsner. See full disclaimer.