INDEPENDENT WATER CONSULTANCY · MARINE WATER MANAGEMENT · CREW EDUCATION
VORENICO / FLAG STATE WATER COMPLIANCE

UK Flag · MCA Drinking Water

Source-indexed control register for potable water safety, vessel evidence and professional Vorenico review. Apply UK rules to UK-flag yachts only; select a different register for other flag states.

HOW THE MEMBER REGISTER WORKS

Four steps to a review-ready vessel dossier

Choose only your vessel's registered flag. The crew records what can be demonstrated; Vorenico assesses the relevant evidence and identifies outstanding actions.

  1. 01
    Describe the vessel

    Vessel name, commercial or private status, length, GT, year and applicable certificate/code.

  2. 02
    Choose a status

    Evidence supplied, action needed, not checked yet, or not applicable with a clear reason.

  3. 03
    Reference proof

    Enter a logbook page, inspection date, laboratory report ID, maintenance record or corrective action. This field is text only; documents are shared separately.

  4. 04
    Save and export

    Save your draft, export the CSV and share that register and source documents with Vorenico for review.

Example: Weekly water inspection → Evidence supplied → “Inspection 26 Oct 2026; deck logbook p.84; responsible engineer: Chief Engineer”.

VERIFIED PRIMARY REFERENCES · 28 OCTOBER 2026

From regulation to vessel evidence.

Document what the vessel does, identify missing proof and link each item to the Water Safety Plan. Applicability is not automatic: the operation, registration, applicable Yacht Code and transition arrangements must be checked by Vorenico.

What this is — and is not

An evidence preparation and technical review tool. A completed checklist does not mean statutory flag acceptance or legal compliance.

Flag registers under research

United Kingdom: checklist below. Cayman Islands: separate verified register. Isle of Man, Bermuda, Marshall Islands and Malta each have separate evidence registers. Select the correct flag from the navigation above. Applicable national rules and exemptions still require vessel-specific review.

02 / UK potable-water evidence register

Duty: an express obligation only within the stated scope. Conditional: check vessel applicability first. Guidance: risk-based advice, not a universal statutory requirement. Recording evidence is not the same as independent verification.

UK01

Water quality and supply

Sources & capacity

Duty

Ensure sufficient, safe, palatable drinking water suitable for consumption, provided free of charge to seafarers.

Scope: UK commercial / MLC in scope

Evidence requested: Supply capacity review, water test results, incident and corrective-action records.

MSN1845 · §3 / regulation 34 ↗

UK02

Documented weekly inspection

Monitoring & records

Duty

At least weekly, the master or authorised delegate together with catering staff inspects food/drinking-water supplies and catering equipment. Record results in the official logbook.

Scope: UK commercial / MLC in scope

Evidence requested: Official logbook entries, inspector authorisation and linked inspection checklists.

MSN1845 · §6 / regulation 36 ↗

UK03

Safe storage and handling

Storage & distribution

Duty

The owner and master must ensure water is stored and handled according to applicable requirements; they must take account of Annex 2 guidance.

Scope: UK commercial / MLC in scope

Evidence requested: System drawings, tank registry, procedures, sanitation and maintenance programme.

MSN1845 · §4 / regulation 35; Annex 2 ↗

UK04

Crew reporting and access to records

Governance

Guidance

Make food and drinking-water safety reports available to crew and safety committee on request, in English and a language the crew understands.

Scope: UK commercial / MLC in scope

Evidence requested: Crew briefings, controlled accessible procedures and report distribution.

MSN1845 · §7.1 ↗

UK05

Drinking-water outlets

Distribution

Conditional

Provide cold drinking-water taps in the specified galleys, bars, pantries and applicable mess rooms.

Scope: Where MSN 1844 accommodation provisions apply

Evidence requested: General arrangement, outlet map and physical verification.

MSN1844 · §19.1 ↗

UK06

Two-day water storage

Capacity

Conditional

Provide tanks with at least two days supply and sufficient overall capacity for crew, with water-production plants considered in the provision.

Scope: Where MSN 1844 accommodation provisions apply

Evidence requested: Tank capacities, daily use estimate, endurance calculation and reliability review.

MSN1844 · §19.2 ↗

UK07

Automatic disinfection of produced water

Treatment

Conditional

Water produced onboard must be treated using suitable automatic disinfection.

Scope: Where MSN 1844 §19.3 applies and water is produced onboard

Evidence requested: P&ID, dosing/control configuration, interlocks, commissioning and service records.

MSN1844 · §19.3 ↗

UK08

Water points across accommodation

Distribution

Conditional

Provide adequate fresh drinking water piped to convenient accommodation locations.

Scope: Where REG Yacht Code Part A §21.7 applies

Evidence requested: Water outlet location plan and onboard walkthrough.

REG2024 · §21.7(1) ↗

UK09

Anti-scalding and water temperature controls

Hot water

Conditional

Install thermostatic anti-scalding valves and maintain hot-water temperatures in accordance with the applicable Administration requirements.

Scope: Where relevant REG Yacht Code Part A provisions apply

Evidence requested: Mixer valve records, temperature trend data and administration-specific limits.

REG2024 · §21.7(2), 21A.7(2), 21B.11 ↗

UK10

Emergency drinking-water reserve

Emergency preparedness

Conditional

Carry a separate emergency drinking-water reserve of at least 2 litres per person as specified in the applicable Code.

Scope: Where relevant REG Yacht Code Part A §§21.7 / 21A.7 / 21B.11 apply

Evidence requested: Headcount, reserve litres, storage location, expiry and inventory checks.

REG2024 · §21.7(3), 21A.7(4), 21B.11 ↗

UK11

Watermaker and treatment acceptance

Treatment

Conditional

Watermakers and disinfection arrangements require acceptance by the competent Administration; check any conditions or alternative technology approval.

Scope: Where relevant REG Yacht Code Part A provisions apply

Evidence requested: Administration acceptance correspondence, approved drawings and equipment declarations.

REG2024 · §21.7(3), 21A.7(4), 21B.11 ↗

UK12

REG weekly inspection record

Monitoring & records

Conditional

Document weekly inspections under the master’s authority of water supplies, water-storage/handling spaces and relevant accommodation areas.

Scope: Where relevant REG Yacht Code Part A provisions apply

Evidence requested: Completed weekly records, defect list and closure evidence.

REG2024 · §21A.18 / §21B.17 ↗

UK13

Bunkering hose and fill-point hygiene

Bunkering

Guidance

Use dedicated, identified potable-water hoses; keep them capped and clean; flush before loading and protect fill points from cross-connection.

Scope: MCA Annex 2 guidance; confirm on-vessel applicability

Evidence requested: Hose register, bunkering log, photos and crew instruction.

MSN1845 · Annex 2 §2 ↗

UK14

Disinfection monitoring, bypasses and alarms

Treatment

Guidance

Plan safeguards around automatic disinfection, bypass prevention, appropriate alarms and independent alarm power arrangements.

Scope: MCA Annex 2 guidance; assess design and equipment risk

Evidence requested: Schematic, alarm tests, periodic calibration and fail-safe demonstration.

MSN1845 · Annex 2 §3 ↗

UK15

Residual disinfectant and method selection

Treatment

Guidance

Assess suitable disinfection; Annex 2 describes 0.2 mg/L free chlorine or 1.0 mg/L chloramine as good practice during loading, not a mandatory universal threshold. Silver-stabilised peroxide is discussed; do not infer automatic approval of other formulations.

Scope: Good-practice guidance, NOT a universal legal chlorine limit

Evidence requested: Selected treatment rationale, product approvals, appropriate chemical tests and monitoring.

MSN1845 · Annex 2 §§3.1–3.5 ↗

UK16

Watermaker source and RO performance

Production

Guidance

Assess intake contamination risks, filtration, validated RO performance and rapid action on off-spec product. Consider remineralisation and corrosion.

Scope: MCA Annex 2 guidance for water-making plant

Evidence requested: Seawater intake assessment, salinity/conductivity trends, diversion logic and product-water data.

MSN1845 · Annex 2 §4 ↗

UK17

Storage and distribution contamination

Storage & distribution

Guidance

Check potable marking, tank rotation, segregation from sewage and non-potable lines, backflow, stagnation and dead legs.

Scope: MCA Annex 2 hygiene guidance

Evidence requested: Updated drawings, physical inspections and risk register.

MSN1845 · Annex 2 §6 ↗

UK18

Planned maintenance and disinfection

Maintenance

Guidance

Set and verify vessel-specific tank cleaning, hose sanitation, filter service, calorifier inspection and outlet maintenance; distinguish published recommendations from obligations.

Scope: MCA Annex 2 recommended maintenance, not universal statutory intervals

Evidence requested: PMS job cards, tank certificates, chemical procedures, corrective actions.

MSN1845 · Annex 2 §7 ↗

UK19

Risk-based Fresh Water Safety Plan

WSP

Guidance

Map source-to-tap hazards, control measures, monitoring and response actions in a maintained Fresh Water Safety Plan.

Scope: MCA recommends a FWSP especially for complex systems

Evidence requested: Current plan, system map, risk register, control matrix, review log.

MSN1845 · Annex 2 §1 ↗

Editorial reference: 28 October 2026. MGN 397 is officially withdrawn and is not used as current MCA authority. This tool cannot assess compliance without vessel-specific competent review, relevant flag and class correspondence, and verification of amendments and exemptions.
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