author: - affiliation: Universidade de Brasília / Núcleo Takwara name: Takwara, Fabio Resck orcid: 0000-0001-8815-3885 date: '2026-03-04' H.5281/zenodo.18827106 H.5281/zenodo.18827106 keywords: - ecological sanitation - tourism - dry toilets - wetlands - public health - Amazon - Chapada Diamantina - ANA NR 8/2024 language: en license: CC BY 4.0 related_works: - 10.5281/zenodo.18827106 - 10.5281/zenodo.18827106 series: Technical Series Regenerative Amazon Platform — Research and Development subtitle: Infrastructure, Public Health, and Tourism Growth Report title: 'Technical Note: Ecological Sanitation and Tourist Bio-resilience' translations: en: TAK_nota-tecnica-saneamento-ecologico_en.md es: TAK_nota-tecnica-saneamento-ecologico_es.md pt: TAK_nota-tecnica-saneamento-ecologico.md type: Technical-Scientific Bulletin version: '2.1'
Technical Note: Ecological Sanitation and Tourist Bio-resilience
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The National Sanitation Scenario: Between the Historical Deficit and Institutional Transition
Understanding the sanitation panorama in Brazil requires a detailed analysis of the transition between official data collection systems. In 2023, the traditional National Sanitation Information System (SNIS) ended its activities, giving way to the National Basic Sanitation Information System (SINISA) starting in 2024.1 This change is not just technological, but methodological, aiming to meet the precepts of Law No. 14,026/2020, the New Sanitation Legal Framework. However, the Regulation and Rural Sanitation modules are still in the conception phase, creating a gap in precise data on lower population density areas, precisely where ecotourism exerts the greatest pressure.3
The indicators consolidated up to the base year of 2022 reveal an alarming reality: about 35 million Brazilians live without access to treated water, and approximately 100 million do not have sewage collection.4 This infrastructural liability has direct consequences on public health. In 2023, Brazil recorded 11,544 deaths from Diseases Related to Inadequate Environmental Sanitation (DRSAI).5 In the year 2024, the financial impact was measured at R$ 174.3 million spent by the Unified Health System (SUS) on 344.4 thousand hospitalizations resulting from a lack of sanitation.6
The following table presents the macrostructural indicators that define the starting point for any sanitation intervention in the national territory:
| National Sanitation Indicator (Base Year 2022-2024) | Value/Status | Source |
|---|---|---|
| Population without drinking water | \~35 million | 4 |
| Population without sewage collection | \~100 million | 4 |
| Annual DRSAI deaths (2023) | 11,544 | 5 |
| Hospitalizations due to inadequate sanitation (2024) | 344.4 thousand | 6 |
| SUS expenditure on DRSAI hospitalizations (2024) | R$ 174.3 million | 6 |
| Municipalities with a Drainage and Management Plan | 5.3% | 8 |
| Sewage universalization target (2033) | 90% | 9 |
The precariousness of sanitation in urban areas is frequently exacerbated by extreme weather events. The combination of a low percentage of sewage treatment with the absence of adequate drainage systems — present in only 5.3% of municipalities — creates what experts call a "perfect storm".8 During rainy periods, raw sewage mixes with rainwater, increasing the incidence of diseases such as leptospirosis, which recorded 4,142 cases in 2024, more than double that recorded in 2021.8 This degraded urban scenario serves as a warning of the potential destruction of the image of natural tourist destinations if preventive measures are not taken.
Tourism Dynamics in Brazil: Growth and Pressure in Protected Areas
While basic sanitation struggles to overcome historical deficits, Brazilian tourism demonstrates exceptional vitality. The year 2024 was marked by historic records, with Conservation Units (UCs) receiving 25.5 million visitors.11 The sector not only recovered from the impacts of the pandemic but established new levels of revenue and investment. International tourism, for example, generated foreign exchange revenue of US$ 7.34 billion in 2024, exceeding the targets established by the National Tourism Plan for 2027 years in advance.12
The sector's economic impact is accompanied by a significant increase in foreign direct investment, which reached US$ 360 million in 2024, a 40% growth compared to the previous year.15 This capital flow, however, is frequently concentrated in the hotel industry and transportation infrastructure, neglecting the basic sanitary engineering that sustains the biological viability of the destinations. Ecotourism and nature tourism are the fastest-growing modalities, driven by the global perception of Brazil as a strategic destination for sustainability, reinforced by events such as COP30 in Belém.13
| Growth of the Brazilian Tourism Sector (2024-2025) | Statistical Data | Source |
|---|---|---|
| Visitors in Conservation Units (2024) | 25.5 million | 11 |
| Foreign Direct Investments in Tourism (2024) | US$ 360 million | 15 |
| International Tourism Foreign Exchange Revenue (2024) | US$ 7.34 billion | 12 |
| Expected financial movement (Summer 24/25) | R$ 148.3 billion | 16 |
| Formal jobs in the sector (2024) | 3.51 million | 17 |
The paradox lies in the fact that the 45% growth in international tourist arrivals between January and September 2024 exponentially increases the organic load in locations devoid of a sewage network.14 Highly scenic trails, such as Cachoeira da Fumaça in Chapada Diamantina, face flows of up to 100 visitors per day in high season.18 Without infrastructure to manage human waste, ecotourism ceases to be a source of conservation and becomes a vector for pathogens, threatening the health security of visitors and residents.18
Data Confrontation: The Impact of Inaction in the Chapada Diamantina Destination
Chapada Diamantina serves as the most emblematic case study of the conflict between tourist prestige and sanitary precariousness. Municipalities such as Lençóis and Palmeiras, which are gateways to the National Park, present sanitation indicators that contrast with the high average ticket of visitors. In Lençóis, although 100% of the sewage collected by EMBASA is treated, the network reaches only 41.3% of the total population.19 The service deficit reaches 6,386 inhabitants, resulting in the massive use of rudimentary cesspools (43% of households) or direct discharge into rivers.19
Local reality reveals that investment in sanitation infrastructure directly preserves the region's main economic asset: river water. Statements from residents indicate that the bad smell caused by raw sewage once kept tourists away, evidencing that environmental aesthetics are inseparable from economic viability.20 The "Myth of Purity," which attracts tourists to the crystalline waters of the headwaters, is frequently broken by outbreaks of waterborne diseases. The 2017 episode, where 32 tourists were infected by schistosomiasis after bathing in tourist areas of the region, remains a real warning about the risks of neglected sanitation.18
| Sanitation Indicators - Municipality of Lençóis (BA) | Value | Source |
|---|---|---|
| Population Served with Sewage | 41.3% | 19 |
| Population Served with Drinking Water | 80.7% | 19 |
| Households with Rudimentary Cesspool or Hole | 43.0% | 19 |
| Households without Bathroom or Toilet | 319 units | 19 |
| Treated Sewage in Relation to Generated Sewage | 53.6% | 19 |
| Households Subject to Flooding | 18.4% | 19 |
Contamination by schistosomiasis in Lençóis, which recorded 944 cases in 2017, demonstrates how the lack of sanitation and the presence of unassisted riverside populations create sanitary traps.22 The prohibition of use of tourist spots like Poção generates immediate lost profits for the tourist trade and damages the destination's international reputation.24 Sanitary security is therefore not a luxury, but the indispensable technical basis for maintaining the "Chapada" brand as a world-class destination.18
Technical Validation of the Proposal: Modular Ecological Sanitation
Faced with the technical and economic impossibility of extending conventional sewage networks to remote and rugged areas, the Modular Ecological Sanitation proposal emerges as the most appropriate engineering response. The system is based on "segregation at source," treating solids and liquids independently through decentralized biological processes.
The Modular Dry Toilet (BSM): Containment Engineering and Nutrient Cycle
The BSM is designed to operate without the use of drinking water for flushing, eliminating the main vector transporting pathogens to the groundwater. The system uses a seat with a urine separator, ensuring solids remain with low humidity, which is fundamental for inhibiting odors and for the aerobic composting process.
The technical design parameters for the BSM are rigorous and based on biological processing capacity:
- Cover Mechanics: Each use is followed by the deposition of \~0.5L of sawdust, mechanically activated by a pedal or lever. This ensures the visual barrier and insect control.
- Active Chamber and Reverse Logistics: Waste is collected in interchangeable 200L drums. The useful volume is calculated at 150L (75% capacity) to allow safe handling by operators.
- Negative Pressure Ventilation: A 100-150mm duct with a low-power solar exhaust fan (10-20W) ensures air flow is unidirectional, pulling odors out of the cabin and ensuring user comfort.
- Maturation and Sanitization: The system outlines a rotation of drums allowing a resting period of 10 to 12 months, the time technically necessary to eliminate viruses, bacteria, and helminth eggs before any final destination.
For the Fumaça Trail, with a demand of 100 visitors/day, dimensioning validates the installation of 4 cabins with a stock of 20 drums, ensuring the weekly exchange cycle supports high-season operation without sanitary failures.
Greywater Treatment: The Role of Constructed Wetlands
Greywater, sourced from sinks and showers, while possessing a lower organic load than blackwater, contains detergents and other residues that must not be discharged directly into the soils of APPs (Permanent Preservation Areas). The proposed solution uses Constructed Wetlands (planted beds), which act as biological "kidneys" in the ecosystem.
The proposed hydraulic module is composed of three treatment stages:
- Settling Tank (100-200L): Dimensioned for a minimum retention time of 2 hours, retaining suspended solids and fats.
- Sand and Gravel Filter: Performs physical removal of fines before the effluent enters the planted bed.
- Subsurface Flow Wetlands: Beds of 10-15m² for every 20 users/day, cultivated with macrophyte plants such as Typha and Canna. The microbiota associated with the roots digests the organic load, returning polished water to the environment.
Scientific studies in similar scenarios in Brazil prove that wetland technology is extremely efficient in tropical climates, achieving orthophosphate removal of up to 92% and coliform reduction by two to four logarithmic units.26
Legal Framework and Regulation: Support for Decentralized Solutions
The ecological sanitation proposal is not only technically viable but finds full backing in the current Brazilian legal framework. The New Sanitation Legal Framework (Law No. 14,026/2020) and the guidelines of the National Water and Basic Sanitation Agency (ANA) establish that universalization must be sought through conventional methods or adequate alternative solutions.28
Reference Standard (NR) No. 8/2024 from ANA is the fundamental regulatory instrument validating this proposal. It provides for progressive universalization goals and explicitly recognizes that, in localities where the public network is unfeasible, individual or collective alternative solutions must be computed towards meeting the goals.29 NR 8/2024 allows the use of technologies such as septic tanks with post-treatment, constructed wetlands, and evapotranspiration tanks, provided there is a standard from the Subnational Regulatory Entity (ERI) providing for their use.30
Furthermore, Consolidation Ordinance No. 5/2017 of the Ministry of Health reinforces the duty of the municipal public power to ensure the surveillance of water quality and the potability standard, regardless of the geographical location of the consumption point.18 This means that the provision of sanitation on trails and protected areas is not at the manager's discretion but an administrative obligation subject to control by civil society and the Public Prosecutor's Office.
Economic and Social Viability Analysis: The Return on Green Investment
Investment in decentralized sanitation presents a cost-benefit ratio superior to attempts at forced urbanization in preserved areas. The cost of inaction, measured in epidemiological outbreaks and loss of tourist attractiveness, is significantly higher than the CAPEX required for implementing ecological modules. It is estimated that the universalization of sanitation in Brazil could generate income gains for tourism on the order of R$ 4 billion per year.32
The proposal for Chapada Diamantina introduces the concept of "Operation and Maintenance (O&M) via Sanitation Brigades." This model generates direct socioeconomic benefits:
- Green Job Generation: Operating the system creates qualified local income for guides and brigaders, strengthening the sense of belonging and territorial vigilance.
- Liability and Asset Management: By adopting the "Adopt a Trail" model, brands and investing partners can align their ESG Compliance goals with direct biome conservation and community health, gaining visibility in a highly prestigious destination.
- Financial Resilience: Every R$ 1 invested in sanitation saves R$ 4 in public health, allowing municipalities to reallocate resources from curative treatments to preventive and promotional actions for the destination.33
Environmental Education and the Citizen Surveillance Protocol
The technical sustainability of systems depends intrinsically on visitor behavior. The project incorporates conduct guidelines based on "Leave No Trace" principles. The tourist ceases to be just a landscape consumer and becomes a conservation partner by correctly using dry toilets and respecting the prohibition of detergents in watercourses.
The "Water Sentinels" protocol is the front line of territorial defense. It trains local associations to carry out simplified microbiological monitoring, such as the H2S test and Colitest, creating a "Critical Points Map".18 These data allow the issuance of early warnings to visitors and provide unquestionable technical subsidies for advocacy actions with the Public Prosecutor's Office and municipal secretariats.
Strategic Conclusions and Recommendations
The confrontation between the vigor of the tourism sector and the fragility of basic sanitation in Brazil reveals that the sector's economic growth is threatened by the very organic impact it generates. The Modular Ecological Sanitation proposal for Chapada Diamantina, technically validated by this report, represents a necessary paradigm shift: sanitation must be treated as a strategy for environmental conservation and economic competitiveness.
To make this scenario viable, it is recommended to:
- Approve the Pilot Project on the Fumaça Trail: Use the most iconic trail of the Chapada as a laboratory for logistical validation and user acceptance, generating data for replication in other national destinations.
- Institutionalization via ANA's NR 8/2024: Ensure that decentralized systems are integrated into the Municipal Sanitation Plans of Lençóis and Palmeiras, allowing access to public funds and public-private partnerships under the protection of national regulation.29
- Strengthening Local Governance: Establish technical cooperation agreements between ICMBio, City Halls, and Civil Brigades to maintain the systems, ensuring that sanitation is operated by those who live in and protect the territory.
- Monitoring and Transparency: Keep the citizen surveillance protocol active and transparent, using citizen science as a tool of political pressure for continuous improvement in the region's environmental health.18
Only destinations that treat their sewage with technical seriousness and decentralized innovation will remain viable and resilient in the global high-impact nature tourism scenario. Basic sanitation is not just an engineering work; it is the foundation of biological sovereignty and Brazil's economic success as an environmental power.
References Cited
See the Portuguese original for a full list of bibliographic references.
🎋 Takwara — Sustainable Technology and Sovereignty in the Amazon DOI: 10.5281/zenodo.18827106
How to Cite
APA: Takwara, F. R. (2026). Technical Note: Ecological Sanitation and Tourist Bio-resilience (Version 2.1). Technical-Scientific Bulletin — Takwara Nucleus / University of Brasília. https://doi.org/10.5281/zenodo.18827106
🎋 Takwara — Sustainable Technology and Sovereignty in the Amazon