Freshwater HAB Observation, Sampling, and Cyanotoxin Analysis

Identify the waterbody and affected area, ownership and access, current signs or restrictions, designated and actual uses, potential receptors and exposure routes, drinking-water or intake relevance, current responsible Tribal, state, territorial, local, health, environmental, veterinary and site authorities, decision deadline, communication owner, and what evidence could change the decision. Surveillance, incident response, advisory support, reopening, drinking-water operations, trend monitoring and research require different designs and methods.

Choose the branch before field activity: observation only; collect under a current approved plan and laboratory package; use existing controlled samples or data; or stop and refer. Observation only is correct when the authority needs a visual report, collection would add avoidable exposure, access or permission is unresolved, the laboratory or method is not ready, required containers or preservation are unavailable, or the result could not reach the decision in time. Record why no sample was collected and what authority received the observation; never fabricate a zero or non-detect.

Sources: [5], [1], [4]

From a safe and authorized location, record color, form, distribution, shoreline or open-water accumulation, mats, streaks, clumps, foam, dispersed color, visible cells or flakes, odor only if naturally apparent, dead or distressed organisms, nearby users and animals, weather, wind, recent rain, water level, inflows and outfalls, current signs or barriers, coordinates and accuracy, time with offset, photographs and observation confidence. Preserve look-alike possibilities rather than identifying by sight.

Apply the current safety plan for access, water, boat, weather, heat and cold, lightning, unstable shore, traffic, wildlife, contaminated water, aerosols, PPE, decontamination, waste and emergency response. Do not enter a visible accumulation just to reach a planned point. If safe access fails, record the intended and actual observation support and use the observation-only or stop-and-refer branch.

• Current advisory, closure, signage and authority instructions checked before access
• Potential human, pet, livestock, wildlife, drinking-water and occupational exposures routed separately
• Observation occurs without touching, tasting, closely smelling, wading or sending animals into suspicious material
• Access, boat, weather, lightning, heat, water, bank, traffic, aerosol, decontamination and lone-work controls are satisfied
• Photos preserve scale, direction, location and time without requiring unnecessary exposure
• Unsafe, inaccessible or prohibited areas remain explicit no-observation or observation-only limitations

Sources: [19], [4], [3]

Define target population, inference area, station frame, selection method, depth and integration support, event and seasonal timing, revisit logic, minimum evidence, access and nonresponse rule, comparison or reference logic, and how wind or rapid movement affects the design. Include relevant shorelines, coves, open water, inflows, outflows, intakes, exposure areas, depth layers, benthic or attached growth and connected reaches only when the decision requires them.

Separate response-oriented sampling from status or trend designs. A probability or otherwise representative design can support estimates for a defined population; targeted sampling can characterize a visible accumulation or exposure concern but cannot estimate average lake condition without a valid design. Record every replacement, inaccessible station and deviation, and retain the original denominator.

Sources: [5], [12], [14]

Predefine whether the sample represents surface water, a visible scum or mat, a discrete depth, depth-integrated water, a shoreline exposure area, a transect or composite, an intake, benthic material, or another method-defined matrix. Specify the collection device and contact materials, approach direction, surface disturbance, integration or compositing rule, subsampling, homogenization if allowed, and the relationship among organism, pigment, gene and toxin aliquots.

Do not silently mix targeted and representative samples, or split a heterogeneous accumulation and assume identical aliquots. If multiple analyses require different agitation, lysis, preservatives or containers, define the split before collection with the laboratory. Field duplicates measure variability at their exact support; they do not prove homogeneity across a bloom.

• Sample purpose, target population, matrix, location, depth, time and collection support are explicit
• Targeted, judgmental, probability, systematic, integrated, composite and convenience samples retain their design labels
• Visible accumulations and surrounding water are separate unless the approved method deliberately combines them
• Composite components, proportions, times and mixing rules are traceable
• Aliquot and split rules preserve heterogeneity and method-specific requirements
• Duplicates, blanks and other QC samples identify the variability or contamination question they address

Sources: [14], [5], [1]

Confirm the laboratory can accept the matrix and decision-specific target. Record laboratory and accreditation or program status where applicable; contact and after-hours instructions; analyte or organism list; method and version; screening or confirmatory role; matrix and fraction; total, dissolved or other operational definition; lysis or extraction; bottle, cap and volume; preservative or quench; chilling or freezing; holding and shipping; light protection; custody; reporting and detection limits; dilution and reanalysis; QC; electronic deliverable; archive; turnaround; rejection criteria; and result-notification path.

EPA lists laboratories as a resource but does not endorse them. Laboratory availability does not establish fitness for the project, and a test-kit name does not define the complete method. Verify whether an assay reports a family response, selected analytes, genes, cells, pigments or another endpoint, and whether the method is approved or merely informative for the intended authority decision.

Sources: [3], [6], [17], [1]

Follow the exact current method and laboratory package. Do not substitute a generic bottle, plastic or glass assumption, sample volume, preservative, quenching agent, temperature, freeze/thaw sequence, filter, lysis, extraction, holding time or shipping schedule from another toxin or matrix. Record bottle and lot where controlled, field split, fraction, preparation state, preservative or quench, collection and processing times, temperature evidence, light protection, freeze and thaw events, packing, shipment and every deviation.

Cell rupture can release intracellular toxins during collection, transport, freezing, thawing, sonication, extraction or treatment. Preserve whole-water, dissolved or filtrate, particulate, lysed, unlysed, extracted and calculated states separately. If a result is intended to represent combined intracellular and extracellular toxin, the controlling method, not an informal shake or freeze, defines how that result is produced.

• Every aliquot links to parent sample, target, method, matrix, fraction and preparation state
• Container, volume, cap, preservative, quench and light protection match laboratory instructions
• Filtration, centrifugation, settling, homogenization, lysis and extraction occur only under the approved method
• Collection, processing, cooling, freezing, thawing, shipment, receipt and analysis times are captured with time basis
• Temperature and custody evidence is retained where required
• Method or holding failures remain deviations and do not become ordinary samples through relabeling

Sources: [3], [7], [8], [9], [10], [11]

Assign stable project, event, station, observation, sample, parent, aliquot, fraction, QC, container, shipment and laboratory accession identifiers. Labels and custody should preserve waterbody, coordinates and datum, location description, depth and reference, collection date and time with offset, collector, matrix, target and method request, fraction and lysis state, preservation, hazards or special handling, and comments without relying on memory or a photograph alone.

Reconcile field inventory with shipment and laboratory receipt before calling the handoff complete. Record received containers and condition, seal and custody status, receipt time and temperature evidence where required, accession crosswalk, requested and accepted analyses, fraction or preparation discrepancies, insufficient volume, breakage, leakage, missed holding, rejection, consultation, corrective action and impact. A laboratory accession number is not acceptance of every sample or requested method.

1. 01

   Inventory before departure

   Reconcile every parent sample, aliquot, fraction, QC sample, container, requested analysis, preservation and custody entry at the field site.

2. 02

   Transfer with attribution

   Record each relinquishment and receipt, date and time, person or carrier, seal or package condition, shipment ID and exception.

3. 03

   Confirm laboratory receipt

   Obtain the laboratory receipt or login record and crosswalk field IDs to accessions, accepted analyses and reported discrepancies.

4. 04

   Resolve without rewriting

   Document clarifications, rejection, re-label decisions and scope impacts as amendments; never silently change the original sample identity or fraction.

Sources: [12], [13], [1]

Define preservation and preparation, settling or concentration, chamber or slide, magnification, fields or transects, taxonomic authority and reference, counted unit, minimum effort, subsampling, calculation, analyst qualifications, quality checks, image or voucher handling, and reporting resolution through the approved method. Preserve cells, colonies, filaments or trichomes, natural units, biovolume, biomass and percent composition as distinct results.

Microscopy can support assemblage and abundance evidence but not toxin concentration. A taxon associated with toxin production does not establish a toxigenic strain, gene expression or toxin in the sample. Non-detection is bounded by volume examined, preparation, analyst and taxonomic resolution, detection capability, spatial and temporal support, and the method's ability to observe fragile or uncommon taxa.

Sources: [13], [3], [5]

For extracted chlorophyll or other laboratory pigment results, preserve filter or sample support, extraction, method, calibration, reporting unit, holding and quality controls. For in vivo fluorescence, preserve instrument and sensor identity, optical channel, units or raw output, configuration and compensation, calibration or check, depth, orientation, stabilization, ambient light, turbidity and colored-material context, fouling, bubbles, cleaning and as-found/as-left evidence.

Pigment response can support relative patterns, targeted investigation or a locally validated model. It cannot identify every cyanobacterium, count cells, establish cyanobacterial dominance, measure toxin or determine safety. Do not treat readings from different sensor models, optical geometries, firmware, factory algorithms or extracted methods as interchangeable because a dashboard uses the same label.

• Extracted pigment and in vivo fluorescence remain separate methods and units
• Sensor, channel, configuration, calibration/check, compensation and firmware are traceable
• Turbidity, colored material, ambient light, bubbles, physiology, temperature and fouling are evaluated
• Local cell, pigment or toxin relationships retain model data, range, validation and uncertainty
• No pigment threshold is presented as a universal toxin or safety threshold

Sources: [12], [13], [3]

Screening kits, quantitative immunoassays such as ELISA, protein phosphatase inhibition assays, selected-analyte chromatographic methods, LC-MS-class methods, and conventional or quantitative PCR answer different questions. Confirm whether the decision needs a rapid screen, family response, selected congener or analyte concentration, organism or toxin-gene evidence, or another endpoint. Preserve cross-reactivity, matrix interference, standards, calibration, extraction, lysis, method performance, reporting limits, confirmation and QC.

An ADDA ELISA can respond broadly to microcystins and nodularins without distinguishing congeners. Selected-analyte LC-MS/MS methods can identify named analytes covered by the method and available standards but do not measure every variant or toxin. PCR can detect organism or toxin-production gene targets but not toxin concentration. A positive screen may require authority-defined confirmation; a negative screen or confirmatory panel applies only to its targets and capability and never establishes absence of all cyanotoxins.

Sources: [6], [7], [8], [9], [10], [11], [3]

Freeze the original field, custody, receipt, laboratory report and electronic deliverable before normalization. Reconcile identities, locations, depths, collection and handling times, method and version, analyte panel, matrix and fraction, lysis or extraction, units, detection and reporting limits, dilution, qualifiers, case narrative, reanalysis, rejected samples and amendments. Preserve missing and conflicting evidence as findings.

Evaluate blanks, field and laboratory duplicates, matrix spikes or fortified samples, controls, standards, calibration checks, inhibition and amplification controls, recoveries, dilutions, interferences, precision, completeness and holding against the exact approved method and project criteria. Verification asks whether requirements were met; validation evaluates usability and limitations; the responsible authority separately determines how a valid result affects public status.

Sources: [1], [2], [13], [9]

Record product and version, sensor and acquisition time, processing date, pixel and waterbody support, cloud and quality flags, shoreline and mixed-pixel exclusions, spatial resolution, detection or algorithm range, map scale, download or API record, and whether field evidence was available. Satellite estimates represent remotely sensed surface optical conditions for resolvable waters; they may miss small waterbodies, narrow coves, shoreline accumulations, subsurface blooms, benthic mats, cloudy scenes and conditions outside algorithm support.

EPA explicitly states that satellites cannot currently provide real-time toxin concentrations. Appearance, a CyAN category or cyanobacteria index, a chlorophyll product and a pigment sensor are not interchangeable with a named toxin method. Use remote products to support surveillance, prioritization and spatial context, then retain field and laboratory methods and authority decisions as separate evidence.

• Product, version, acquisition and processing times, pixel support and quality flags retained
• Cloud, land adjacency, mixed pixels, small-waterbody, shoreline, depth and algorithm limitations stated
• Satellite and field collection times are not presented as simultaneous unless they are
• Remote estimate is not relabeled as cells, extracted pigment, toxin, exposure or advisory status
• A blank, masked or unavailable pixel is not interpreted as absence

Sources: [15], [16], [3]

Release observation and result records with project/event/station/sample IDs; design and target population; actual location, depth and time; observation-only or sampling branch; appearance and photographs; method and analyte or organism panel; matrix, fraction, lysis and preparation; original unit and mass basis; reporting limits and qualifiers; custody and receipt; QC and validation state; satellite product lineage where used; represented and unsampled areas and times; current authority status; reviewer; intended use; version; and correction path.

Hand the package to the responsible health, environmental, veterinary, drinking-water, recreation, site and communication authorities named in the plan. State separately what was observed, what was sampled, what each method detected or did not detect, what remains unknown, what public action is currently in force, and when the next update is owned. Use the companion application guide for response and recovery. This guide supplies no algaecide, oxidant, aeration, mixing, nutrient, harvesting or other treatment design, product, dose, schedule or trigger.

• Observation, sample, analytical result, validation, exposure interpretation, authority decision, public message and recovery state are separately labeled
• Targeted and representative samples are not pooled into one lake-status statement
• Appearance, pigment, genes and satellite estimates are not reported as toxin or safety
• Every positive or negative result identifies the exact target, method, panel, fraction, limits, place and time
• Public status names issuing authority, affected area and activities, effective time, next update and current source
• Corrections preserve superseded versions and identify affected records, decisions and audiences

Sources: [18], [1], [2], [5]