US EPA Drinking Water Health Advisories for Cyanotoxins

US EPA Drinking Water Health Advisories for Cyanotoxins Lesley V. D’Anglada, Dr. P. H. US Environmental Protection Agency Office of Water/Office of Science and Technology IAFP 2016 August 1 st, 2016 St. Louis, Missouri

Presentation Overview • What are cyanobacterial harmful algal blooms • Routes of exposure and adverse health effects • Discuss the adverse effects in animals and plants • Overview of the current public health Federal and US States Regulations and Guidelines for cyanotoxins in drinking and recreational waters • Describe the EPA drinking water health advisories • Opportunity for Questions

Why are we talking about HABs? • The prevalence of HABs in freshwater is increasingly reported in the U. S. and worldwide • Algal blooms can cause: • Hypoxia, leading to fish kills • Taste and odor problems in treated drinking water • Toxins at levels that may be of concern for human health • Loss of drinking water, recreational/fishing uses, contributing to economic losses • Presence in source water and finished drinking water • 2014: City of Toledo, OH (population ~500, 000) issued a “do not drink” advisory, > 1 µg/L total microcystins detected in finished water in a drinking water system on western Lake Erie • 2015: Ohio River HAB affected 3 States • 2016: Florida issued a State of Emergency for four counties due to HABs in surface water

What are HABs and cyano. HABs?

Overview of Harmful Algal Blooms (HABs) • Algal blooms are natural components of marine and freshwater flora. • When an algae specie multiply and forms a bloom, they can affect aquatic life and water quality leading to scum formation, fish kills, and/or unpleasant odors. These are known as Harmful Algal Blooms (HABs). • HABs tend to occur in late summer and fall in temperate zones and potentially year-round in tropical and subtropical zones • Under the right conditions, all type of algae can cause harmful algal blooms.

Cyanobacterial Blooms • In freshwater, cyanobacteria or blue-green algae, are the most common “algae”, some of which produce highly potent cyanotoxins. • One species can make multiple toxins and different toxins can be produced by a number of different species making visual monitoring difficult. • Toxins can either reside inside Freshwater Type of Causative Organism Cyanotoxins Toxin the cell (intracellular) or be Anatoxin-a Neurotoxin Anabaena spp. released into the water Anatoxin-a (s) Neurotoxin Aphanizomenon spp. (extracellular). Planktothrix spp. • Microcystins Cylindrospermopsin Hepatotoxin Cylindrospermopsis raciborskii, Aphanizomenon • Group of at least 100 ovalisporum variants Lyngbyatoxin Dermal Lyngbya spp. • Primarily affect the liver Toxin (hepatotoxin) Microcystins Hepatotoxin Microcystis aeruginosa Anabaena spp. • Most studied and Planktothrix spp. widespread cyanobacterial Saxitoxins Neurotoxin Anabaena circinalis toxin (Microcystin-LR) Lyngbya wollei

2007 EPA National Lakes Assessment Microcystin Sampling • Microcystins were found throughout the United States especially in the upper Midwest. • 32% overall detections (401/1238) (Reference Lakes/Resampled lakes) Source: http: //ks. water. usgs. gov/cyanobacteria NLA link: http: //water. epa. gov/type/lakes/upload/nla_newlowres_fullrpt. pdf

Adverse Effects to Humans and Animals

Exposure and Health Effects • Potential routes of exposure: • Consumption in drinking water and food • Ingestion during recreational activities • Dermal contact • Inhalation of aerosolized toxins • Health effects related to exposure to cyanotoxins: • Hepatotoxic (affects the liver) • Microcystins and Cylindrospermopsin • Neurotoxic (affects the nervous system) • Anatoxin-a and Saxitoxin • Dermatoxic (affects the skin) • Lipopolysaccharides and Lyngbyatoxin • Symptoms of acute exposure are irritation to eyes, ears, throat, rashes, and skin lesions. • Toxicity data (needed to determine thresholds) are not available for many cyanotoxins.

Effects of Cyanotoxins in Animals and Plants • Pets and livestock can be impacted by cyanotoxins • Animals are exposed by drinking water and/or eating algal biomass (surface mats or fur grooming) • Can have rapid onset of symptoms and mortality • Cyanobacterial cells and toxins can contaminate spray irrigation water and subsequently be associated with crop plants. • Low levels of cyanotoxins could be absorbed by roots, migrate to shoots, and then be translocated to grains and or fruits. • Cyanotoxins concentration in grains and fruits are very low. • Generally, roots accumulated more than the leaves. • Cyanotoxins inhibit plant growth causing visible toxic effects on the plant such as leaf discoloration. • Further investigation is needed to understand the uptake and fate of microcystins and other cyanobacterial toxins by food plants.

Cyanotoxins and Fish • Cyanotoxins levels in edible fish and shellfish are highly variable depending on trophic level and fish organ or tissues. • Concentrations are higher in liver > gut > kidneys and gonads > muscle tissue • Concentrations are higher >phytoplanktivorous > omnivorous > carnivorous fish • More research is needed to quantify the toxicity in fish caused by cyanotoxins and the bioaccumulation in aquatic food webs. • Rather than biomagnification, biodilution seems to occur in the foodweb with toxins being subject to degradation and excretion at every level. • One of research needs identified is the need to quantify the total toxicity in fish caused by MCs variants and other secondary metabolites.

Current Public Health Guidelines for Cyanotoxins in Drinking and Recreational Waters

Guidelines and Regulations in Drinking Water • No US Federal regulations for cyanobacteria or cyanotoxins in drinking water in the U. S. • Safe Drinking Water Act Requirements (SDWA Section 1412(b)(1)) • Contaminant Candidate List • List of unregulated contaminants that are known or anticipated to occur in public water systems and may require a drinking water regulation. • EPA publishes the list every five years. • Cyanobacteria and their toxins included in CCL (1 , 2, 3 and draft 4) • Unregulated Contaminant Monitoring Rule (UCMR) • Collect data from selected public water systems. • EPA included 10 cyanotoxins in UCMR 4 for monitoring (2018 -2021). • Regulatory Determination (RD) • Determine whether or not to regulate; EPA publishes determinations every on a five year cycle. • RD 1, 2 and 3 – No Regulatory Decision - not sufficient information

Drinking Water Guidelines for Cyanotoxins Authority/Country/State Microcystins CYL Anatoxin-a Saxitoxin World Health Organization (WHO), 2003 1 μg/L MC-LR - - - Health Canada, 2002 1. 5 μg/L MCs (proposed) - - - Brazil, 2005 1 μg/L MC-LR 15 μg/L - 3 μg/L 1. 3 μg/L MC-LR TE 1 µg/L 3 μg/L 1 µg/L MC-LR - - - 20 μg/L 0. 2 μg/L Australia, 2009 Singapore, Poland, Norway, China, Netherlands, Korea, Japan, Italy, France, Germany, Finland, Czech Republic Ohio, 2015 0. 3 μg/L bottle-fed 0. 7 μg/L bottle-fed infants and preschool age children 1. 6 μg/L school 3 μg/L school-age children and adults 0. 3 μg/L age 5 and younger 0. 7 μg/L age 5 and younger Oregon Minnesota 1. 6 μg/L age 6 and older 3 μg/L age 6 and older 0. 1 µg/L MC-LR - - 0. 3 μg/L age 5 and younger 1. 6 μg/L age 6 and older 14

Guidelines and Regulations in Recreational Water • No federal regulations for cyanobacteria or cyanotoxins in recreational water in the U. S. • World Health Organization (WHO) Guidelines: • Guidance values for recreational water have been adopted by many countries and some states based on WHO guidelines.

State California Connecticut Recreational Water Guidance/Action Levels Microcystin: 0. 8 µg/L; Anatoxin-a: 90 µg/L; Cylindrospermopsin: 4 µg/L -Visual Rank Category 1: Visible Material is not likely cyanobacteria or water is generally clear. -Visual Rank Category 2: Cyanobacteria present in low numbers. -Visual Rank Category 3: Cyanobacteria present in high numbers. Illinois Microcystin-LR concentration results approach or exceed 10 µg/L Indiana Level 1: very low/no risk < 4 µg/L microcystin-LR Level 2: low to moderate risk 4 to 20 µg/L microcystin-LR Level 3: serious risk > 20 µg/L microcystin-LR Warning Level: Cylindrospermopsin: 5 ppb Iowa Kansas Kentucky (Louisville District) Massachusetts Nebraska Microcystin ≥ 20 µg/L Health advisory: >4 µg/L to <20 µg/L for microcystin or > 20, 000 cell/m. L to <100, 000 cell/m. L cyanobacteria cell counts Health Warning: > 20 µg/L or > 100, 000 cell/m. L cyanobacterial cell counts and visible scum present Advisory: >20, 000 cells/m. L of cyanobacteria cell counts; Caution: > 100, 000 cells/m. L of cyanobacteria cell counts 14 µg/L for microcystin-LR and ≥ 70, 000 cells/m. L for cyanobacteria cell counts Microcystin ≥ 20 µg/L New Hampshire >50% of cell counts from toxigenic cyanobacteria North Carolina Visible discoloration of the water or a surface scum may be considered for microcystin testing Ohio Oklahoma Oregon Rhode Island Texas Vermont Virginia Washington Wisconsin Microcystin-LR: PHA: 6 µg/L; NCA: 20 µg/L; Anatoxin-a: PHA: 80 µg/L; NCA: 300 µg/L Saxitoxin: PHA: 0. 8 µg/L; NCA: 3 µg/L; Cylindrospermopsin: PHA: 5 µg/L; NCA: 20 µg/L 100, 000 cell/m. L of cyanobacteria cell counts and > 20µg/L for microcystin Option 1: Visible scum and cell count or toxicity Option 2: Toxigenic species >100, 000 cells/m. L Option 3: Microcystis or Planktothrix > 40, 000 cells/m. L Option 4: Microcystin : 10 µg/L ; Anatoxin-a: 20 µg/L; Cylindrospermopsin: 6µg/L; Saxitoxin: 100 µg/L Visible cyanobacteria scum or mat and/or cyanobacteria cell count > 70, 000 cells/m. L and/or ≥ 14 µg/L of microcystin-LR > 100, 000 cell/m. L of cyanobacteria cell counts and >20µg/L microcystin 4, 000 cells/m. L cyanobacteria cell counts or ≥ 6µg/L microcystin-LR and the visible presence of cyanobacterial scum Anatoxin-a ≥ 10 µg/L Microcystin provisional action level: 6µg/L Microcystin-LR: 6 µg/L; Anatoxin-a: 1 µg/L; Cylindrospermopsin: 4. 5 µg/L; Saxitoxin: 75 µg/L > 100, 000 cells/m. L or scum layer 16

Overview of USEPA’s Drinking Water Health Advisories for Cyanotoxins

EPA Drinking Water Health Advisories (HA) • Informal technical guidance for unregulated drinking water contaminants to assist federal, state and local officials, and managers of public or community water systems in protecting public health during emergency situations. • HAs are non-regulatory concentrations in drinking water that is not expected to cause adverse non carcinogenic effects for a specific exposure period. • Short term exposures: one-day and ten-day (children) • Chronic Exposures: lifetime (for adults) • Carcinogenic Reference: Calabrase, E. (1989). Safe Drinking Water Act. CRC Press, ISBN 0873711386. 240 pages.

US EPA Health Advisories • As of 2016, Drinking Water Health Advisories for 200 chemicals (and toxins). • 162 One-day HA • 162 Ten-day HA • 119 lifetime advisories for adults. • Only one HA (Nitrate and Nitrite) targeted a different age subgroup (4 months old). Infants less than 4 months old are most sensitives for methemoglobinemia following exposure to nitrates and nitrites. • They are subject to change as new information becomes available. http: //water. epa. gov/action/advisories/drinking/upload/dwstandards 2012. pdf

HESD Development • 2012 - Joint effort with Health Canada • • HC: Update the 2002 DW Guideline for microcystins USEPA: Develop Health Advisories (HAs) for Cyanotoxins • 2013 - Literature Review • 2013 - Development of Health Effects Support Documents (HESD) for microcystins, cylindrospermopsin and anatoxin-a • • Comprehensive review of the health effects information Provides the health effects basis for the development of HAs • 2014/15 - External Peer Reviews HESDs for microcystins, cylindrospermopsin and anatoxin-a • Peer reviewers affirmed data are inadequate to develop an HA for anatoxin-a • • EPA will continue evaluating health effects data on anatoxin-a as new information becomes available. Peer reviewers confirmed data are adequate to develop HAs for microcystins and cylindrospermopsin https: //www. epa. gov/nutrient-policy-data/health-effects-support-documents

HAs Development • 2015 – Development of Health Advisories for microcystins and cylindrospermopsin • June 17 th, 2015 – HAs Published https: //www. epa. gov/nutrient-policy-data/drinking-water-health-advisory-documents • EPA’s Office of Ground Water and Drinking Water (OGWDW) published the Recommendations for Public Water Systems to Manage Cyanotoxins in Drinking Water • Companion to the HAs to assist public drinking water systems (PWSs) that choose to develop system-specific plans for evaluating their source waters for vulnerability to contamination by microcystins and cylindrospermopsin. ) https: //www. epa. gov/nutrient-policy-data/recommendations-public-water-systems-manage-cyanotoxins-drinking-water

HAs for Microcystins and Cylindrospermopsin • EPA published Drinking Water Health Advisories (HA) for microcystins and cylindrospermopsin in 2015 • MC-LR is considered a surrogate for all microcystins. • Exposure duration: 10 -day value • Short term exposure is more consistent with expected exposure pattern. • No lifetime or carcinogenic value derived. Toxin 10 -day Health Advisory Bottle-fed infants and pre-school children School-age children and adults Microcystins 0. 3 µg/L 1. 6 µg/L Cylindrospermopsin 0. 7 µg/L 3 µg/L • http: //water. epa. gov/drink/standards/hascience. cfm#micro

Mean Drinking Water Ingestion Rates by Age Groups 140 120 100 80 60 40 20 0 th nths ears ears on m 3 mo 6 mo 2 mo <2 y <3 y <6 y <11 y <16 y <18 y <21 y ≥ 21 y 1 < to <1 1 to 2 to 3 to 6 to 1 to 6 to 8 to th 1 3 1 1 1 6 Bir HAs for Microcystins • Bottle-fed infants consume large amounts of water compared to their body weight. • At 6 years and older, exposure on a bodyweight basis is similar to that of an adult. HAs for Cylindrospermopsin

Toxicity Research Needs Identified • Male reproductive system toxicity following sub-acute to chronic oral exposure. • Toxicity of microcystin during pregnancy and effects on offspring following oral exposure. • The potencies of other microcystin congeners relative to microcystin-LR. • Effects of inhalation and/or dermal exposures to microcystins, cylindrospermopsin, and anatoxin-a. • Acute and chronic toxicity of anatoxin-a. • Chronic toxicity of cylindrospermopsin. • Carcinogenic potential of cyanotoxins. • Health risks from exposure to mixtures of cyanotoxins. • Bioaccumulation of cyanotoxins in aquatic food webs.

Next: Recreational AWQC for cyanotoxins • Clean Water Act § 304(a) recommends recreational Ambient Water Quality Criteria (AWQC) values protective of human health given a primary contact recreational exposure scenario. • EPA is developing recreational AWQC recommendations for the cyanotoxins microcystin toxins and cylindrospermopsin. • The AWQC will focus on exposure as a result of primary contact recreation activities such as swimming where immersion and incidental ingestion of ambient water are likely. – Dermal and inhalation exposures associated with primary contact recreation will be considered if data are sufficient. – Consumption of fish and shellfish will not be considered in the assessments. • Expected Draft: 2016

Disclaimer The views expressed in this presentation are those of the author and do not necessarily represent the views or policies of the U. S. Environmental Protection Agency.

Contact Information Lesley V. D’Anglada, Dr. PH U. S. Environmental Protection Agency Office of Water / Office of Science and Technology 202 -566 -1125 Danglada. lesley@epa. gov EPA’s Cyano. HABs Website www. epa. gov/cyanohabs