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providers n a mex 1 us 0 09176 in 2005 water supply and sanitation in mexico is characterized by achievements and challenges among the achievements is a significant increase in access to piped water supply in urban areas 88 to 93 as well as in rural areas 50 to 74 between 1990 and 2010 additionally a strong nationwide increase in access to improved sanitation 64 to 85 was observed in the same period 1 other achievements include the existence of a functioning national system to finance water and sanitation infrastructure with a national water commission as its apex institution and the existence of a few well performing utilities such as aguas y drenaje de monterrey 7 the challenges include water scarcity in the northern and central parts of the country inadequate water service quality drinking water quality 55 of mexicans receiving water only intermittently according to results of the 2000 census poor technical and commercial efficiency of most utilities with an average level of non revenue water of 51 in 2003 an insufficient share of wastewater receiving treatment 36 in 2006 and still inadequate access in rural areas in addition to on going investments to expand access the government has embarked on a large investment program to improve wastewater treatment access edit rivers in mexico urban 78 of the population rural 22 of the population total water improved water source 97 91 96 piped on premises 93 74 89 sanitation improved sanitation 87 79 85 sewerage 2006 jmp survey census data 80 16 64 source who unicef joint monitoring program jmp 2010 data for water archived 14 may 2011 at the wayback machine and sanitation archived 14 may 2011 at the wayback machine based on the who world health survey 2003 and the census 2000 among the achievements is a significant increase in access to piped water supply in urban areas 96 4 as well as in rural areas 69 4 as of 2018 8 other achievements include the existence of a functioning national system to finance water and sanitation infrastructure with a national water commission as its apex institution the challenges include water scarcity in the northern and central parts of the country inadequate water service quality drinking water quality 11 of mexicans receiving water only intermittently as of 2014 9 poor technical and commercial efficiency of most utilities with an average level of non revenue water of 43 2 in 2010 10 increasing the national percentage of fully sanitized water which at 57 11 is considered to not be enough as the country s theoretically available percentage of water per capita is 60 lower than it was 60 years ago 12 and the improvement of adequate access in rural areas service quality edit a tinaco atop a mexico city home quality of service also leaves much to be desired the 2000 census indicated that 55 of mexican households with access to piped water received services on an intermittent basis in particular in smaller municipalities and poor areas 2 about 36 of wastewater was being treated in 2006 a share that is more than twice as high as the average for latin america 4 however an unknown share of mexican treatment plants do not comply with norms for effluent discharge 2 in many areas local water pressure is insufficient and or unreliable thus many houses have a small water tank known as a tinaco on their roofs water that accumulates in a basement cistern known as an ajibe is pumped up to it to provide pressure through gravity to the rest of the house regardless of pressure in the local system in some newer homes however key appliances have their own pressure systems every year millions of cubic meters of wastewater municipal industrial and agricultural discharges are discharged into water bodies that are improperly treated or without any treatment in mexico wastewater discharges are classified as municipal urban and rural public supply and non municipal other uses such as self supplied industry according to official figures 52 7 of the municipal water generated is treated and 32 of the non municipal water 13 water use edit despite scarce resources in many mexican regions water consumption is at a high level partly favored by poor payment rates and low tariffs in 2006 more than three quarters 76 8 was used for agriculture while public supply only used up 13 9 the remainder being used by thermal power station 5 4 and industry 3 8 14 in 2006 all in all 77 3 billion m3 were consumed in mexico of which 10 7 billion m3 were used for domestic consumption this means that the average domestic use per capita and day was 270 litres 14 water resources edit lake chapala is mexico s largest freshwater lake main articles water resources in mexico and water resources management in mexico in 2006 63 of the mexican water was extracted from surface water such as rivers or lakes the remaining 37 came from aquifers 14 due to the strong growth of population and internal migration toward arid and semi arid regions many water resources in north and central mexico became overexploited the un claims that more than 80 of the world s wastewater that reaches the sea and rivers is untreated the who estimates that some 2 billion people drink drinking water contaminated by excreta exposing themselves to diseases such as cholera hepatitis a and dysentery according to the national water commission groundwater over extraction is at almost 40 percent of total groundwater use 15 in addition conagua estimates that 52 of the superficial water is very polluted whereas only 9 are in an acceptable condition 16 amidst the water crisis occurring in mexico mexico city has been sinking downwards approximately 1 meter every year 17 due to years of draining groundwater for public and agricultural use the negative effects of relying on groundwater has influenced the mexican government to call attention to a campaign titled february 2010 the city may run out of water 18 mexico continues to pump out groundwater from deeper ground layers causing the drainage of soil and weak ground 19 according to the world health organization in 2015 approximately 100 of urban populations used at least basic drinking water sources whereas approximately 94 of rural populations used at least basic drinking water geological factors edit background edit lake bacalar there are three general facts about the evolution in the governance of water pollution 1 water quality suffers when there is low investment in environmental controls little proactive effort in preventing sources of pollution and abandonment of observation systems and monitoring in addition to the low investment in treatment systems 2 population growth and economic development increase the pressure on soil and water the problem of water quality does not only refer to a lack of investment and political will but it is also a problem of aligning investments in water quality in order to achieve greater economic growth 3 despite progress in addressing the flagrant causes of water pollution all the nations of the planet face the challenge of changing established practices as heavy inertia and a stagnant discourse persist in the way of facing the problem eg no resources no capacity mexico s climate is another big contributor as to why some parts of the country have relatively low accessibility to clean and safe water first off the country itself is split between two tropical areas of the globe that make for differing condition in different regions mexico s southern half sits in the inter tropical area of the globe and the northern half of it rests in the temperate area both these wind zones intertropical convergence zones and temperate zones have different wind patterns that cause dry climates in various parts of the country due to the different wind zones two thirds of mexico is considered to be arid to semi arid as they only receive about 500 mm of rain year round the other third of the country is categorized as humid and receives more than 2000 mm of rain all year most of the areas with limited access to clean water are in the arid and semi arid regions 20 droughts edit shot of a drought in located in a sonora mexico desert considering most of the country experiences arid and or semi arid conditions droughts are one of the most common natural disasters in mexico droughts happen when there are low levels of rainfall in a certain area as a result droughts significantly impact agricultural production systems that many people all over the world depend on droughts are also impacted by high temperatures that dry up pieces of land droughts are very common in all of north america and they have 5 levels of intensity regions of mexico which most commonly experience drought like conditions range from veracruz tabasco and the yucatán in may 2016 14 3 of land surface area in mexico experienced dramatic shift in drought levels from moderate to extreme the month of november is primarily known as the time of year when the wet season ends and the dry season begins however in november 2016 regions in the yucatán peninsula and tabasco actually had non stop drought with the previous dry season regarding it as the 40th driest month ever 20 ground water edit the groundwater found all over mexico is used in various different ways three ways that groundwater in mexico is efficiently utilized are in usage distribution and consumption regarding its usage groundwater is extremely versatile in mexico due to its physical characteristics since groundwater is mainly stored in aquifers it is fairly easy to access year round thus also benefiting the country socio economically as far as distribution as mentioned before groundwater is stored in various aquifers that makes available practically anytime to be exact mexico has 653 aquifers placed all around the country this in turn also relates to constitution since 39 of consumable water in mexico comes from sources such as aquifers however even considering the amount of groundwater resources available in mexico in 2016 aquifers mainly in baja california indicating high level of saline soil and brackish water 32 aquifers were identified with saltwater intrusion thus still creating limited access to clean water 20 history and recent developments edit stilt houses off the southwestern end of cayo centro on banco chinchorro waterfall over the basaltic prisms of santa maría regla huasca de ocampo hidalgo mexico in pre conquest mesoamerica water was a deified resource that united indigenous communities water was thought to have been a gift from the gods and was thus held to a high degree of respect and protection the indigenous people performed spectacular feats of engineering creating complex water cultivation systems that both provided water to their large populations and sustainably preserved natural resources the spanish approach to water stood in stark contrast to indigenous valuation of water and commitment of environmental protection primary sources reveal the spaniards initial awe of the ingenuity and complexity of indigenous water systems especially the construction of tenochtitlan now known as mexico city the capital city state of the mexica empire that was built in the center of an enormous lake 21 preventing periodic and destructive flooding in mexico city during the colonial era nearly forced the move of the capital to the mainland of the interior lake system instead the spanish crown invested millions pesos and mobilized tens of thousands of indigenous men in compulsory labor to build a tunnel and then an open cut trench to drain waters out of the basin of mexico the spanish facilitated a series of practices which would eventually lead to ecological destruction including constructing dams burning woodlands and diverting water from lakes and canals 21 the desagüe was finally completed in the late nineteenth century under porfirio díaz who contracted with british entrepreneur weetman pearson to complete the project using modern machinery to dredge a 47 km trench 22 the mexican revolution of the 1910s brought sweeping changes specifically in the area of land and social rights in particular the mexican constitution passed in 1917 instituted major land reforms including the right to communal lands known as the ejido system this system specifically allowed for indigenous communities to legally own traditionally communal lands to live on and work these land rights also included the ownership of any water resources within the territory moreover the responsibility of water supply and sanitation was specifically designated to the federal government a duty that was maintained for many decades post revolution 23 in the second half of the 20th century the mexican water supply and sanitation sector has undergone several changes of organization to improve its performance 1948 1983 centralization edit montículo cinerítico front and bárcena behind volcanic cones on san benedicto one of the revillagigedo islands bárcena has existed only since 1952 since 1948 during the presidency of miguel alemán 1946 1952 responsibility for mexican urban water supply systems was vested in the ministry of water resources secretaría de recursos hídricos srh under the federal government for almost 30 years the whole urban water organization was planned and carried out by the general water and sanitation committee within the srh at the local level federal water boards facilitated some local participation but actually also depended on the srh in 1971 during the presidency of luis echeverría 1970 1976 a new committee for water supply and sanitation systems was introduced by srh facing a high increase in urban population which exceeded the centralized system s capacity to provide services despite the creation of more specialized organizations at the national level the federal government finally had no choice but to decentralize the services to the states and municipalities 24 the belief that water provision should be a gift from the federal government may be rooted in the policies of that centralization period 25 in 1982 the mexican economy collapsed precipitated by the drop in oil prices and federal government spending was severely restricted 1983 1989 decentralization edit president miguel de la madrid 1982 1988 took office during the aftermath of the crash of the mexican economy during his administration municipalities were entrusted with providing water supply and sanitation services within the framework of a general decentralization process at the same time state governments were made responsible for technical and financial assistance they were also authorized to decide about the municipalities capacity for providing the services most municipalities neither received the necessary financial resources nor the technical assistance to fulfill their new responsibilities that is why in 1988 only 10 of 31 mexican states had devolved responsibility to the municipalities and where they did service quality and efficiency usually deteriorated 25 26 1989 1990s creation of conagua and furthe...
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