Water | whatsinit

About

What it is and where it shows up.

Water (H₂O, molecular weight 18.02) is an inorganic compound and the most fundamental food ingredient, acting as a solvent, carrier, hydrating medium, and reactant in virtually all food manufacturing and biological processes. It is declared as an ingredient in fabricated foods when retained in the finished product, and is indispensable for human hydration and metabolism.

Safety summary

The regulatory and scientific consensus.

Water is universally safe for the vast majority of people when consumed in normal quantities and meeting recognised quality standards for microbiological and chemical purity. Extreme overconsumption can cause hyponatremia (critically low blood sodium), a particular risk in infants under 6 months and endurance athletes. Contaminated water poses microbiological and chemical hazards that are governed by WHO drinking-water quality guidelines and national standards rather than food-additive regulations.

Regulatory landscape

What food-safety regulators have decided.

Jurisdiction	Status	Note
FSANZ (Food Standards Australia New Zealand) (Australia)	Approved	Water is not listed as a food additive in the Australia New Zealand Food Standards Code. Packaged water is regulated under Standard 2.6.2. Drinking water quality is governed by the Australian Drinking Water Guidelines (ADWG).source
EFSA (European Food Safety Authority) (European Union)	Approved	Water is not assigned an E number and is explicitly excluded from the scope of Regulation (EC) No 1333/2008 on food additives. It is regulated as a foodstuff in its own right. Drinking water quality is governed by Council Directive 98/83/EC and its 2020 revision (Directive 2020/2184/EU).source
FSSAI (Food Safety and Standards Authority of India) (India)	Approved	Potable water is recognised as a food ingredient under FSSAI regulations. Packaged drinking water and natural mineral water are separately regulated under the Food Safety and Standards (Food Products Standards and Food Additives) Regulations, 2011, with specific quality and labelling requirements.source
FDA (Food and Drug Administration) (United States)	Approved	Water is not classified as a food additive and carries no GRAS petition requirement. Per CPG Sec 555.875, water added to a fabricated food must be declared as an ingredient in order of decreasing predominance under 21 CFR 101.4(a). Adding water unnecessarily or in excessive amounts constitutes adulteration under FD&C Act section 402(b)(4). If all added water is removed during processing (e.g., baking), declaration is not required per 21 CFR 101.100(a)(3).

Who should approach with care

Whose guidance would steer them away.

Infants — Plain water should not be offered to infants under 6 months of age; their immature kidneys cannot excrete excess free water, risking hyponatremia (water intoxication) that can cause seizures—breast milk or formula provides all required hydration per WHO and AAP guidance.

Kidney Disease — Patients with advanced chronic kidney disease or those on dialysis are typically prescribed strict fluid restrictions because impaired renal excretory capacity makes excess water intake a cause of dangerous fluid overload, hypertension, and electrolyte disturbances.

Heart Disease — Patients with congestive heart failure may require individualized fluid restriction (often 1.5–2 L/day) to prevent volume overload and exacerbation of symptoms, as recommended by cardiology clinical guidelines.

Hypertension — High-mineral or high-sodium content in certain mineral or processed waters can contribute to sodium intake, which is relevant for individuals managing sodium-sensitive hypertension; plain low-mineral water poses no concern.

Research citations

The sources behind this verdict.

1FDA. CPG Sec 555.875 Water in Food Products (Ingredient or Adulterant). fda.gov
2other. Water | H2O | CID 962 – PubChem (NIH/NLM). pubchem.ncbi.nlm.nih.gov
3other. Water – ECHA Registration Dossier (EC 231-791-2, CAS 7732-18-5). echa.europa.eu
4FDA. Generally Recognized as Safe (GRAS) – FDA Overview. fda.gov
5WHO. Guidelines for Drinking-water Quality, 4th edition incorporating the 1st and 2nd addenda, 2017. who.int

Independently researched5 citations