Some Context behind the Implementation of Numeric Nutrient Criteria or Why do we have these Water Quality Regulations?

Transcription

1 Some Context behind the Implementation of Numeric Nutrient Criteria or Why do we have these Water Quality Regulations? Mark W. Clark and Thomas Obreza Soil and Water Science Department University of Florida, Gainesville April 20, 2012

2 Overview Federal Clean Water Act State Designated Uses Protective Criteria Implications of Impairment

3 Water Quality Issues of the Past Cuyahoga River 1969

4 Clean Water Act 1972 As part of the Federal Clean Water Act 1972, USEPA requested states develop: Designated uses for waters of the state (lakes, reservoirs, rivers, streams, estuaries and wetlands), Criteria that would protect designated uses, Corrective process that would be implemented if a designated use was not being met (i.e. if the waterbody was determine to be impaired )

5 Designated Uses for Florida Waterbodies Class I Potable Water Supplies Class II Shellfish Propagation or Harvesting Class III Recreation, Propagation and Maintenance of a Healthy, Well-Balanced Population of Fish and Wildlife Class III-Limited Fish Consumption; Recreation or Limited Recreation; and/or Propagation and Maintenance of a Limited Population of Fish and Wildlife Class IV Agricultural Water Supplies Class V Navigation, Utility and Industrial Use F.A.C. Chapter Surface Water Quality Standards

6 Approaches to Protect Designated Use Criteria A standard, rule, or test on which a judgment or decision can be based Concentration or measurement that is protective of the intended uses of the water Types of Criteria: Numeric Narrative

7 Example of Numeric Criteria Dissolved Oxygen Criteria (Current) Class I Shall not be less than 5.0. Class II Shall not average less than 5.0 in a 24-hr period and shall never be less than 4.0. Class III Fresh-Shall not be less than 5.0. Marine-Shall not average less than 5.0 in a 24-hr period and shall never be less than 4.0. Class IV Shall not average less than 4.0 in a 24-hr period and shall never be less than 3.0.

8 Example of Narrative Nutrient Standard Rule FAC in no case shall nutrient concentrations of a body of water be altered so as to cause an imbalance in natural populations of flora or fauna

9 Assessment and Reporting of State Water Quality Continuous monitoring of state waters Biannual reporting of state water quality referenced against standards for specific designated use. 305(b) list sent to USEPA indicating those water bodies that potentially do not attain designated use.

10 Motivation for Numeric Criteria - National Water Quality Assessment The National Water Quality Inventory (1996 report to congress) cites nutrients (nitrogen and phosphorus) as one of the leading causes of water quality impairment in our Nation's rivers, lakes and estuaries. 40% of the rivers were impaired due to nutrient enrichment; 51% percent of the surveyed lakes, and 57% of the surveyed estuaries were similarly adversely affected. Nutrients have also been implicated with both the large hypoxic zone in the Gulf of Mexico, hypoxia observed in several East Coast States, and Pfiesteria-induced fish kills and human health problems in the coastal waters of several East Coast and Gulf States.

11 EPA s National Strategy for the Development of Regional Nutrient Criteria In 1998 EPA rolled out the National Strategy for Development of Regional Nutrient Criteria to encourage all states and tribes to adopt numeric nutrient water quality criteria FDEP and EPA agreed on plan to establish numeric nutrient criteria. Between 2002 and 2009 FDEP spent over 20 million dollars developing numeric criteria.

12 Quality of State Waters Florida Water Quality Assessment (b) report

13 Estuary Impacts Florida Water Quality Assessment (b) report

14 Lake Impacts Florida Water Quality Assessment (b) report

15 Stream Impacts Florida Water Quality Assessment (b) report

16 Quality of Florida Waters ,9180 miles of rivers and streams (8%) 378,435 acres of lakes (26%) 2010 Integrated Water Quality Assessment for Florida Report Nutrients were the first and second reason for listing lakes and estuaries as impaired (based on narrative standard) and the fourth reason for listing streams (after Dissolved Oxygen, mercury and fecal coliform) 549 nutrient related TMDL s

17 Lawsuit from Earthjustice On behalf of several environmental organizations of Florida, a suit in July 2008 claimed that: There was an unacceptable delay by the federal government to set limits for nutrient pollution. Claimed that EPA had previously determined the need for numeric criteria under the CWA. Argued that EPA was obligated to promptly propose criteria for Florida.

18 Timeline of EPA NNC Implementation in Florida January 26, 2010 EPA published Proposed Water Quality Standards for the State of Florida s Lakes and Flowing Waters (75 FR 4173). EPA conducted 13 public hearing sessions in six cities in Florida and held a 90-day public comment period following publication of the proposed rule. 22,000 public comments on the proposed rule

19 EPA Final Rule November 14, 2010 EPA Administrator signed Final Water Quality Standards for the State of Florida s Lakes and Flowing Waters. (did not include S. Florida flowing waters) February 4, 2011 Implementation of Site-Specific Alternative Criteria (SSAC) provision March 6, 2012 Initial Implementation date of final rule extended for 15 months to allow cities, towns, businesses and other stakeholders as well as the State of Florida a full opportunity to review the standards and develop flexible strategies for implementation. March 5, 2012 EPA promulgated an extension of the effective date of this rule by 4 months to July 6, 2012

20 Florida s Alternative Rule April 22, 2011 FDEP asked EPA to withdraw the determination. EPA did not approve or deny request, June 13, 2011 November 10, 2011 FDEP proposes alternative rule December 8, 2011 Alternative rule approved by Florida Environmental Regulation Commission (Adoption of Nutrient Standards)

21 Florida s Alternative Criteria Passed into Law December 9, 2012 FDEP submits amendments to chapters and , F.A.C. (numeric nutrient standards) January 24, 2012 Florida House approves amendments February 10, 2012 Florida Senate approves amendments February 16, 2012 Governor signs Water Quality Criteria into law Pending EPA approval

22 Is this the end? That was just for inland waters north of Lake Okechobee Rule for estuaries, coastal waters and flowing waters in the South Florida Region is currently due to be proposed by EPA May 21, Rule for wetlands has not even been discussed.

23 Some Pro s and Con s of Narrative vs Numeric Criteria Narrative criteria Pro s Allows for site specific interpretation Con s Waterbody is already impaired by the time narrative criteria of impairment is met Threshold of impairment is somewhat subjective Numeric Criteria Pro s Threshold of impairment is a bright line Makes establishing TMDL easier if impairment occurs Con s Initial criteria determination is rarely site specific and prone to under or over protection of waterbody.

24 New Numeric Nutrient Criteria New criteria will not automatically restrict the use of fertilizer. New criteria will not change the designated use of a water body. New criteria will establish a brighter line to evaluate potential nutrient impacts to state waters. New criteria will likely be used to establish discharge permit levels for point sources. New criteria will increase the number of water bodies listed as impaired

25 Impaired Waterbody What if a water body does not meet protective criteria i.e. potentially does not attain designated use? Section 303(d) of the Clean Water Act (CWA) requires states to submit lists of surface waters that do not meet applicable water quality standards (impaired waters) The Florida Watershed Restoration Act (1999) clarified FDEP s authority for the TMDL program and directed the Department to develop a methodology, to implement.

26 How do you know if you are in a TMDL watershed?

27 FDEP s Watershed Management Approach - Five Phase Cycle Phase 1: Watershed Evaluation, evaluate status of the quality of surface water and groundwater to identify potentially impaired waters for which TMDL s may be needed. Phase 2: Strategic Monitoring, verification of listing as impaired and to collect data for TMDL development Phase 3: Developing and Adopting TMDL s, prioritization of impaired waters then development and adoption of TMDL for basin. Phase 4: Developing Watershed Management Plans, plan specifying how pollutant loadings from point and nonpoint sources of pollution will be allocated and reduced in order to meet TMDL requirements. (BMAP) Phase 5: Implementing Watershed Management Plans, implementation of Phase 4

28 Basin Rotation

29 What if a Waterbody is Verified Impaired? 1. Determine source of Impairment low dissolved oxygen level excessive algae growth excess nutrient load 2. Determine threshold concentration or load of pollutant that will still maintain waterbody designated use (assimilative capacity or Total Maximum Daily Load) 3. Determine existing load to waterbody

30 Example relationship between limiting nutrient (P)and chlorophyll-a Mean TP vs. Algal blooms over 40ug/L (Walker and Havens 1995)

31 Determine Nutrient Budget How much can be added and still maintain target water column concentration? Atmospheric Inputs Surface Inputs Water Column target concentration (100 ppb) 40 ppb Surface Outflows How much is presently being added? Internal Loading (recycling) Sediment

32 TMDL includes a Margin of Safety A margin of safety (MOS) is required as part of a TMDL in recognition that there are many uncertainties in scientific and technical understanding of the chemical and biological processes that occur. The MOS is intended to account for such uncertainties in a conservative manner that protects the environment. According to EPA s guidance, a MOS can be achieved through reserving a portion of the load for the future, or using conservative assumptions in calculating the load. TMDL = Point Sources + Nonpoint Sources + Margin of Safety

33 Nutrient Load Reduction TMDL is the assimilative capacity of a watershed and waterbody while still protecting the designated use. The Difference between actual loading and TMDL is the load that needs to be reduced. Load reduction required needs to be allocated among stakeholders.

34 Basin Management Action Plan A Basin Management Action Plan (BMAP) is the primary tool to go about implementing the Total Maximum Daily Load (TMDL) The process for BMAP development involves collaboration among local stakeholders and FDEP staff. Once consensus among stakeholders over the BMAP has been achieved, it is adopted by Secretarial Order and enforced.

35 Recommended Guidelines for TMDL Allocations FDEP Formed Allocation Technical Advisory Committee (ATAC) First step to achieve equity was to level the playing field in treatment effort between point and nonpoint sources. Point source are already required to provide, at a minimum, technology based treatment levels. ATAC felt nonpoint sources should be expected to provide comparable minimum levels of treatment, before additional reductions were expected of point sources. The ATAC subsequently decided that the comparable minimum treatment for nonpoint sources should be the Best Management Practice (BMPs) developed and adopted for that activity.

36 TMDL Allocation Example Maximum load allowed (TMDL) Allocation process address this excess load

37 Step 1 Calculate the amount of pollutant reductions that would be achieved if: a) 45% of all agricultural and silviculture operations in the basin and in upstream watersheds implemented the appropriate BMPs b) 45% of urban areas met stormwater treatment requirements for new development, and c) 45% of the homes with septic tanks within the 100- year floodplain were hooked up to a regional sewer system.

38 Effect of Step 1 Reductions 40,000 pounds short

39 Step 2 If step 1 was not sufficient to meet the TMDL, then calculate if a) 90% of all agricultural and silviculture operations in the basin implemented the BMPs, b) 90% of urban areas met stormwater treatment requirements for new development, and c) 90% of the homes with septic tanks within the 100-year floodplain were hooked up to a regional sewer system.

40 Effect of Step 2 Reduction 22,000 pounds short

41 Step 3 If the reductions for step 2 are not sufficient to meet the TMDL, the third recommended step is to allocate reductions to all sources except those where loading is at background levels or those that have provided treatment beyond BAT levels, in increments of 10% until the TMDL is met.

42 Effect of Step 3 Reductions Step 1 Step 2 Step 3 10,000 lbs 28,000 lbs 15,000 lbs 53,000 lbs Only need an 8% reduction in step 3, not 10 % reduction to meet TMDL target

43 Iterative Process Continuous monitoring required to determine progress toward TMDL target Use attainability is evaluated biannually Revisit TMDL target if use attainment is not met Change TMDL or allocation if necessary Efficacy of BMPs may be revised with more data which may require reassessment of load allocation

44

45 How Does this Relate to GIBMP s? These Policies are the underlying driver to regulate water quality in the State of Florida Ultimate goal is not to create condition of impairment that results in triggering TMDL/BMAP process. Implementation of GI BMPs will reducing the likelihood of triggering impairment condition. GI BMP s provide tools that reduce loads in TMDL watersheds and are part of urban BMAP load reduction strategy.

46 Don t want this.