Short answer: map every source and intended use first
A cistern's existence does not tell you whether it stores rainwater, piped water, trucked water, a mixed supply, or water intended for drinking. Build one exact-property file that connects each source, storage and treatment path, fixture or use, approved record, current condition, test provenance, event history, responsible party, and open decision. This checklist does not declare potability, inspect a cistern, prescribe sampling or treatment, interpret a result, or certify compliance.
- Confirm the address, block and parcel, unit, development, building, owner, landlord, strata, occupancy, and access authority before comparing records.
- Trace public piped, rain-catchment, well, trucked, bottled-backup, and mixed arrangements to the exact outlets and uses they actually serve.
- Keep approval, installed condition, current operation, water-test provenance, and transaction suitability separate; each answers a different question.
- Turn every gap into a dated request with a named official or professional owner, scope, deadline, and closure record.
Complete the exact-property and responsibility screen
Water records can sit across an owner, landlord, strata, tenant, utility, supplier, laboratory, Planning, inspector, plumber, treatment professional, insurer, and attorney. Fix the property identity and decision boundaries first so evidence from another parcel, unit, development phase, source, sample point, or system is not treated as proof.
| Screen field | Evidence to record | Open question owner |
|---|---|---|
| Property identity | Street address, block and parcel, unit, strata plan, building, development phase, site plan, and current use. | Owner/strata, attorney, Lands & Survey, Planning, or Water Authority as relevant. |
| Household and use facts | Occupancy, intended drinking/cooking and non-potable uses, vulnerable household needs, rental or commercial use, and proposed changes. | Household plus owner/strata and the appropriate public or qualified professional route. |
| Asset and access responsibility | Legal owner, common or private asset status, access rights, keys/covers, record custodian, operating owner, and emergency authority. | Attorney, strata, landlord, tenant, property manager, or named asset owner. |
| Transaction control | Document request, inspection or test question, condition, deadline, extension route, cost owner, and decision-maker. | Buyer/tenant, attorney, lender, insurer, owner, or other named principal. |
Build the water-source and use map
Record every source and pathway separately. A tap, utility account, storage tank, delivery invoice, roof gutter, well, filter, or seller statement does not establish what reaches every fixture or whether it is suitable for an intended use. Confirm the current configuration with the responsible parties and appropriately qualified scope.
| Source | Storage or treatment path | Use and evidence question |
|---|---|---|
| Public piped supply | Direct, cistern, treatment equipment, mixed pathway, or unknown. | Which exact fixtures and uses are served, and what current utility/property record confirms the connection and path? |
| Rain catchment | Contributing roof, gutters, downpipes, diversion or first-flush equipment where present, cistern, treatment, and outlets. | What is installed, what is approved, what is maintained, and what uses are actually intended? |
| Well or groundwater source | Well, pump, storage, treatment where present, cross-connections, and outlets. | What current records and qualified assessment establish source, authority, testing, treatment, and intended use? |
| Trucked or delivered water | Supplier, delivery point, transfer, storage, treatment where present, and outlets. | What dated delivery, storage, transfer, supplier, continuity, and testing evidence applies? |
| Bottled or stored backup | Household stock and intended drinking, cooking, or contingency use. | Who owns quantity, rotation, storage, access, and outage communication? |
Reconcile approvals, plans, and installed condition
Ask which Planning approval, Water Authority review, permit, inspection, completion or occupancy evidence, approved drawing, as-built record, variation, and later alteration record should exist for this exact property and work. The Building Code and Planning material identify useful evidence questions; they do not let this page decide applicability, compliance, groundwater relationship, separation, construction, or current condition.
| Record | What it may establish | Reconciliation question |
|---|---|---|
| Planning/Authority record | Reviewed proposal, date, intended source/use, conditions, dimensions, location, and responsible parties. | Does it match the exact parcel, phase, building, current use, and latest approved change? |
| Approved or as-built drawing | Recorded cistern location/size, water and wastewater relationships, catchment or plumbing path, access, and equipment. | What did a qualified physical scope observe, and who resolves any difference? |
| Inspection/completion evidence | A dated process milestone for the stated scope. | What was inspected or excluded, and were later alterations or storm repairs made? |
| Service, cleaning, or test record | One dated activity, sample, observation, result, or recommendation. | Does it answer approval, condition, operation, water quality, or follow-up—or only document one event? |
Create the cistern identity and construction file
Record the approved and observed cistern identities separately: location, capacity record, dimensions, construction and waterproofing record, relationship to groundwater where documented, nearby building drain or sewer evidence, access, covers, outlet, overflow, manhole, and any vents or screens. Route physical verification and code questions to the appropriate qualified and official parties.
- Request the approved plan, permit, inspection/completion records, as-built information, alterations, repairs, and the current qualified condition scope.
- Preserve safe exterior observations and professional reports without treating a visible cover, clear water, absence of odour, or owner assurance as proof.
- The current consolidated Building Code includes contamination safeguards and cistern outlet, overflow, manhole, drainage/sewer-separation, and flood-ingress language for cisterns used for potable-water supply; do not self-apply it to an exact property.
- Do not enter a cistern or turn this record checklist into an entry, cleaning, construction, waterproofing, repair, or clearance instruction.
Map catchment, inlets, overflow, and contamination safeguards
Where rain catchment or another inlet is present, record the actual contributing roof areas, gutters, downpipes, diversions or first-flush equipment, screens, inlet, overflow, nearby contamination sources, cleaning history, alteration history, and the qualified scope that reviewed them. Observation creates a question; it is not design advice or a water-quality conclusion.
| Element | Evidence to retain | Do not infer |
|---|---|---|
| Roof and catchment | Contributing areas, materials record, alterations, nearby work, safe observations, and qualified review. | Suitability or absence of contamination from appearance or roof age. |
| Gutters, downpipes, and diversions | Actual route, screens/diversion equipment where present, maintenance record, blockage/damage notes, and owner. | Correct sizing, operation, first-flush performance, or required configuration. |
| Inlet, outlet, overflow, manhole, and covers | Approved location/detail, current safe observation, access control, repair history, and professional finding. | Compliance, flood protection, watertightness, or safe entry from a photograph. |
| Nearby risk or change | Drain/sewer work, flooding, construction, pest activity, debris, spill, roof work, or cross-connection concern with dates. | Contamination, cause, safe use, or clearance from proximity alone. |
Build the pump, plumbing, and treatment equipment register
Identify every installed pump, pressure component, control, alarm, filter, UV unit, dosing or other treatment device without assuming that visible equipment is required, correctly installed, operating, or effective. Preserve the exact current manual, setting owner, service party, parts and consumables, warranty, power dependency, and unresolved fault record.
| Equipment file | Evidence to request | Escalation trigger |
|---|---|---|
| Identity and installation | Make/model/serial, approved record, installation date, exact water path, manual, warranty, and alteration history. | Unknown identity, missing record, changed pathway/use, unsupported equipment, or installation mismatch. |
| Power, pressure, controls, and alarms | Supply, panel/control, alarm, pressure equipment, backup/restart information, access, and owner. | Alarm, outage, unusual operation, damaged control, inaccessible component, or unknown owner. |
| Treatment and consumables | Exact device, stated purpose, before/after pathway, current service record, parts, consumables, and qualified findings. | Expired/missing item, bypass, open recommendation, unclear setting, or unsupported effectiveness claim. |
Build the water-testing chronology and provenance ledger
Water Authority and DEH pages provide current public routes for private cistern or well testing and clarification. Confirm availability, instructions, scope, fees, and next steps before collecting anything. A report is bounded by the sample date, point, collector, handling, requested analyses, method, and stated limitations; it does not prove every outlet, ongoing potability, cistern construction, treatment effectiveness, or transaction suitability.
| Testing field | Record | Decision boundary |
|---|---|---|
| Sample identity | Exact date/time, source, collection point, before/after-treatment status, collector, role, and instruction source—or unknown. | No assumption that the sample represents another point, date, source, or pathway. |
| Laboratory request | Laboratory, request/reference, chain or handling record if supplied, requested and reported analyses, and result date. | Do not infer omitted tests, prescribe a panel, or treat a rate sheet as a testing plan. |
| Result and limitations | Exact report, method/context stated by the laboratory, qualifiers, and any explicit limitations. | No checklist interpretation, pass/fail expansion, medical advice, or ongoing-water claim. |
| Interpretation and closure | Named qualified/public-health party, scope/date, advice boundary, action owner, deadline, follow-up, and clearance record if required. | The principal relies on the appropriate current advice—not a summary generated by this page. |
Build the cleaning, maintenance, and service chronology
Keep each cleaning, pump, plumbing, treatment, filter, UV, dosing, inspection, or other service event as a dated record. Ask the current public and appropriately qualified parties what scope and interval apply to the exact system; do not turn a prior invoice, owner routine, supplier schedule, or general recommendation into a universal instruction.
| Date/event | Scope and evidence | Observation/action | Close-out |
|---|---|---|---|
| Routine service | Provider, role/authority, exact equipment/path, checklist, parts/consumables, report, and invoice. | As written by the provider: normal, monitored, adjusted, repaired, referred, or unresolved. | Owner response, completion evidence, next-review source, and retained record. |
| Cistern cleaning or related work | Trigger, requested scope, access and safety control, responsible party, waste route where relevant, report, and follow-up. | Observed condition and provider recommendation without checklist entry, cleaning, disinfection, or reuse instruction. | Completion/inspection/testing or other clearance evidence only where directed by the responsible qualified route. |
| Fault, outage, alarm, taste/odour, or quality concern | First time, duration, affected source/outlets, event/power context, safe photos/logs, contacts, and notices. | Temporary household action and qualified/public escalation as directed—without template diagnosis. | Written finding, work, test/interpretation if directed, communication, and unresolved items. |
Use a separate storm, flood, outage, and event branch
Water Authority and HMCI material supports treating storms, flooding, service interruptions, wastewater events, power loss, equipment alarms, ingress, and damage as separate dated evidence. General guidance does not prove that a cistern was contaminated or that absence of visible ingress means it was not. Follow current official alerts and route the exact facts to the appropriate public and qualified parties.
| Trigger | Evidence to preserve | Confirmation and decision boundary |
|---|---|---|
| Floodwater or stormwater near/inside the system | Date, location, official alert, safe photos, observed ingress/damage, use restriction, and household notice. | HMCI, Water Authority, DEH, laboratory, and qualified-service route; no contamination or clearance verdict from proximity alone. |
| Water or wastewater service event | Interruption notice, backup/overflow/odour observation, affected source/path, contacts, and chronology. | Authority/DEH/qualified scope; no cause or water-quality diagnosis from an observation. |
| Pump, power, alarm, or treatment fault | Equipment identity, time, outage/alarm, affected outlets, service report, and communication. | Qualified service/owner/strata decision; no bypass, setting, repair, or safe-use instruction from this page. |
| Health symptom or urgent water concern | Exact observations, affected people, source/outlet, time, reports, and official/professional contacts. | Clinician/emergency/public-health and qualified water route as appropriate; this page gives no medical or result advice. |
Build the backup and continuity file
Continuity depends on the exact household, source, storage, treatment, power, access, and official event context. Record backup sources and responsibilities without presenting a generic stock quantity, trucked-water process, treatment method, or reuse rule as suitable for every property.
- List the backup source, intended use, current stock or access route, storage/rotation owner, purchasing authority, and household communication path.
- Record which pumps, controls, alarms, pressure systems, UV units, dosing equipment, or other treatment depend on power and who owns outage response.
- Keep supplier/delivery, transfer, storage, cross-connection, testing, and current official guidance questions separate.
- Document vulnerable household needs, access constraints, landlord/strata responsibilities, and the event threshold for escalation or temporary relocation decisions.
Build the ownership, strata, cost, and access matrix
A shared or strata water system can fail operationally even when one component works. Record legal asset ownership, record custody, access, routine service, testing, emergency authority, contractor authority, invoice and reserve responsibility, tenant notice, insurer notification, and the handover that follows a sale or tenancy change.
| Responsibility | Evidence | Cost/handover question |
|---|---|---|
| Legal and physical asset owner | Title/strata/lease documents, approved plan, common/private treatment, easement/access, and attorney review. | Who can authorise access, testing, service, alteration, repair, emergency action, or replacement? |
| Operating and record owner | Service contract, testing file, manuals, logs, contacts, reporting cadence, and unresolved work. | Who retains evidence, receives alarms/results, communicates restrictions, and closes follow-up? |
| Budget and insurance | Reserve/budget, recent costs, proposals, unpaid invoices, claims/notifications, exclusions, and professional advice. | What is confirmed, provisional, excluded, shared, financed, or subject to approval? |
| Closing/tenancy transition | Keys/access, manuals, contacts, results, service records, warranties, open items, notices, and retained copies. | Who accepts each item, by when, and what written evidence closes it? |
Use a written handover and decision log
Turn every missing record, result-provenance gap, event, or unresolved observation into a dated request, professional scope, response, cost/allowance question, condition owner, deadline, extension route, and explicit principal decision. The buyer, tenant, lender, insurer, owner, or other named principal—not this page, a laboratory link, or a directory provider—decides whether evidence is sufficient for the intended purpose with appropriate advice.
- List confirmed source/use facts, documents received, approved records, installed-condition evidence, current operation, test provenance, event history, assumptions, and open questions separately.
- Name the exact scope needed: utility/source confirmation, Planning/Authority records, legal/access review, property inspection, plumbing/treatment review, laboratory service, qualified result interpretation, insurance/lender review, or another current route.
- Record quote or allowance scope, exclusions, currency, tax, access, approvals, uncertainty, expiry, and who carries overruns without treating an estimate as a diagnosis or final cost.
- Keep extensions, written replies, work evidence, follow-up testing or clearance where directed, household communication, and the final principal decision together.
- Do not let one plan, inspection, service, cleaning, invoice, or laboratory result substitute for approval, condition, every outlet/date, ongoing water quality, title/access, insurer/lender review, or transaction advice it was not designed to answer.
Trust note
Last updated August 2026. This guide is written for relocation planning and should be verified with licensed Cayman professionals for legal, tax, immigration, medical, insurance, or financial decisions.
Reference points: Water Authority — Laboratory Services, Water Authority — Testing Services, Water Authority — Laboratory Rates, Department of Environmental Health — FAQs, Department of Environmental Health — Sanitation, Water Authority — Additional FAQs, Water Authority — Water Safety, Hazard Management Cayman Islands — Hurricanes, Hazard Management Cayman Islands — Flooding, Cayman Islands Building Code Regulations (2022 Revision), Department of Planning — Commercial Plumbing Submission Guidance.