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Republic of the Philippines 
HOUSE OF REPRESENTATIVES 
Quezon City 
TWENTIETH CONGRESS 
First Regular Session 
HOUSE BILL NO. 2889
Introduced by Rep. Romeo S. Momo, Sr. 
EXPLANATORY NOTE 
The serious impact of Climate Change is imminent and dangerous, including, but not 
limited to super-typhoons and severe flooding together with other rain-related disasters. 
This is further aggravated by the country’s natural vulnerability to disasters.  
It is a State policy to provide protection for the safety of life and limb of the Filipino people 
against natural and man-made calamities.  
Thus, it is the intent of this measure to require all new subdivisions, condominium 
communities, malls, government institutions, central business districts, information 
technology parks, and other vital public establishments to construct rain harvesting facility 
to pre-empt floods caused by incessant and continuous heavy rains and storms on one 
hand, and to provide adequate source of household water on the other. With similar intent, 
spirit and purpose to the existing proposed measures, albeit limited to some areas only, 
this proposed measure intends to cover the entire Philippines to achieve maximum 
nationwide awareness and benefit.  
The immediate passage of this bill is therefore most earnestly sought. 
ROMEO S. MOMO, SR. 
1st District Representative 
Surigao del Sur 
August 4, 2025
9:31 am


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Republic of the Philippines 
House of Representatives 
Constitution Hills, Batasan Complex, Quezon 
TWENTIETH CONGRESS 
First Regular Session House Bill No. 2889
INTRODUCED BY 
REPRESENTATIVE ROMEO S. MOMO 
AN ACT  
MANDATING THE ESTABLISHMENT AND MAINTENANCE OF A 
RAINWATER HARVESTING FACILITY IN ALL NEW INSTITUTIONAL, 
COMMERCIAL, INDUSTRIAL, AND RESIDENTIAL DEVELOPMENT 
PROJECTS NATIONWIDE 
Be it enacted by the Senate and the House of Representatives of the Philippines in 
Congress assembled 
SECTION 1. Short Title. – This Act shall be known as the “Rainwater Harvesting 
Facility Act”. 
SEC. 2. Declaration of Policy. – It is a declared policy of the State to protect 
and advance the rights of the people to a balanced and healthful ecology in accord 
with the rhythm and harmony of nature. Pursuant thereto, the State shall mandate 
the installation of rainwater collectors and rainwater harvesting facilities to promote 
sufficient water supply in time of calamities or weather disturbance due to the effects 
of climate change and to reduce flooding problems in the country. It shall urge the 
conservation of potable water and shall engage the active participation of the public 
and private sector in the flood mitigating efforts and initiatives of the government. 


 
 
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To this end, the State shall mandate the construction of rainwater harvesting 
facilities in all new public and private institutional, commercial, industrial, and 
residential development projects nationwide. Owners or developers of these 
development projects requiring the issuance of building permits are likewise 
mandated to design and construct a rainwater harvesting facility to prevent or delay 
the release of rainwater and runoff water into the drainage systems, creeks, and 
natural waterways. 
 
SEC. 3. Purpose. – This Act seeks to establish minimum rainwater management 
requirements and controls to protect and safeguard the general health, safety, and 
welfare of the public against the ill effects of flood on one hand, and water shortage 
on the other. This Act pursues the following objectives: 
(a) Reduction of flooding, siltation, increases in stream temperature and stream 
bank erosion, and maintain the integrity of stream channel by regulating the 
accumulation of rainwater runoff in any proposed and existing institutional, 
commercial, industrial, and residential developments; 
(b) Prevention of the degradation of water quality by averting non-point source 
pollution caused by rainwater runoff developments; 
(c) Regulation of the annual volume of surface water runoff from any specific 
site during and following a development so as not to exceed the pre-development 
hydrologic regime in an area; and 
(d) Establishment of standards for rainwater management control to ensure 
that these standards and the facilities thus built are properly complied with and do 
not pose a threat to public safety. 
SEC. 4. Definition of Terms. – As used in this Act: 
(a) Applicant/Permittee – refers to any person, firm, partnership, corporation, 
head of government or private institution, or an organization of any character 
applying for the issuance of permits and certificates;  
(b) Building/Structure – refers to a three-dimensional physical development 
erected within a lot or property, or any combination of, or all of its three different 
levels (at grade, below grade, above grade). The term buildings/structures as used in 


 
 
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this Code shall invariably refer to both proposed and existing physical developments 
within a lot;   
(c) Building Official – refers to a building official as appointed or designated 
pursuant to Presidential Decree No. 1096, otherwise known as the National Building 
Code of the Philippines (NBCP);   
(d) Building permit – refers to a legal document issued by the Building Official 
which serves as authorization to begin any construction, demolition, addition, or 
renovation of a property; 
(e) Certificate of occupancy – refers to a permit issued by the Office of the 
Building Official (OBO) indicating that the use of the building or land is in conformity 
with the Zoning Ordinance or that has been a legal variance therefrom; 
(f) Channel – refers to a natural or artificial watercourse with definite bed and 
banks that conducts flowing water continuously or periodically;  
(g) Detention – refers to a rainwater management practice of temporarily 
storing rainwater runoff to control the peak discharge rate and to likewise induce 
settling of pollutants through gravity; 
(h) Developer – refers to a person or entity who undertakes land improvement 
and land development activities; a developer may only be contracted to develop and 
may or may not be the owner of the development, such as a building structure being 
built;  
(i) Development – refers to any man-made change to improved or unimproved 
real estate, including buildings or other structures, mining, dredging, filling, grading, 
paving, excavations, or drilling operations;   
(j) Flood frequency – refers to a record of past flood events or occurrences that 
yield flood estimates used principally to compare expected changes in flood damages 
with economic and social cost or benefits guiding a contemplated action;   
(k) Infiltration – refers to the process of percolating or gradually filtering 
rainwater into the subsoil; 
(l) Institutional building – refers to civic building that can be funded 
privately or by the government. It also refers to any structure that fulfills a role 


 
 
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related to healthcare, education, recreation, or public works. It shall include city, 
municipal and barangay halls, court houses, judicial centers, executive and 
legislative buildings, police headquarters, detention facilities, military bases, police 
and fire stations, transportation terminals, schools and universities, museums, art 
galleries, cultural centers and the like; 
(m) Office of the Building Official (OBO) – refers to the Office authorized to 
enforce the provisions of PD 1096 and its implementing rules and regulations in the 
field as well as the enforcement of orders and decisions made pursuant thereto. 
(n) Rainwater – refers to water fallen as liquid precipitation from roof 
catchment or other hard impervious non-pedestrian, non-vehicular surface that is 
captured, filtered and stored; 
(o) Rainwater collection – refers to the capture, diversion and storage of 
rainwater for a number of different purposes including, but not limited to, landscape 
irrigation;  
(p) Rainwater Collection System – refers to a facility designed to capture, 
retain, and store rainwater flowing off a building, parking lot, or any other manmade, 
impervious surface, for subsequent onsite use; 
(q) Rainwater Design Manual – refers to the Planning and Design Manual 
for the Control of Erosion, Sediment and Rainwater of the Department of Public 
Works and Highways (DPWH); 
(r) Rainwater harvesting facility – refers to a structure such as a vertical 
detention tank, horizontal water tank, open retarding basin, and multi-use water 
catchment area, or an on-site regulation pond used to prevent or delay the release of 
rainwater into the public drainage system; 
(s) Rainwater management – refers to the use of structural or non-structural 
practices that are designed to reduce rainwater runoff pollutant loads, discharge 
volumes, and peak flow discharge rates;  
(t) Rainwater runoff – refers to water flow on the surface of the ground, 
resulting from precipitation;  


 
 
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(u) Rainwater treatment – refers to a process by which collected rainwater is 
filtered or cleaned through either structural or non-structural means to prevent or 
reduce point source or nonpoint source pollution inputs to rainwater runoff and water 
bodies, as well as to upgrade rainwater for re-use;  
(v) Recharge – refers to the replenishment of underground water reserves;  
(w) Redevelopment – refers to any construction, alteration or improvement 
exceeding one hundred (100) square meters in high density areas where existing land 
use is for commercial, industrial, institutional, or multi-family residential purposes;  
(x) Return period – refers to the average length of time in years for a rain-
related natural disaster of given magnitude to be equaled or exceeded by the length 
of time that a rainwater-related disaster may probably recur; 
(y) Surface water – refers to all naturally occurring water found in estuaries, 
lakes, rivers, ponds, reservoirs, ponds, seas, etc.; 
(z) Watercourse – refers to a permanent or intermittent stream or other body 
of water, either natural or man-made, which gathers or carries surface; and 
 
SEC. 5. Rainwater Harvesting Facility Requirement. – An owner or 
developer of a new institutional, commercial, industrial, or residential development 
project shall incorporate in its building plan a rainwater collection system consistent 
with the purpose of this Act. 
 
It is hereby prescribed that all new government buildings should incorporate in 
their design a rainwater harvesting facility and facility for storage. It is also 
prescribed that such rainwater harvesting and storage facilities shall be constructed 
in all old government buildings. 
 
The DPWH, through its attached agencies, and in coordination with the 
Department of Science and Technology (DOST) or any government agency mandated 
to ensure sufficient supply of drinking water, shall install a rainwater treatment 
facility in all new government institutional buildings. The Department of Health 
(DOH) shall supervise the filtration and purification processes to ensure that the 
rainwater is safe for drinking. 


 
 
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The rainwater treatment facility or device shall be regularly monitored and 
evaluated by the DPWH, in coordination with the DOH, DOST, and the Department 
of Environment and Natural Resources (DENR), through the local government units 
(LGUs) concerned. 
 
To conserve potable water, rainwater collected by a harvesting facility may be 
used for non-potable and suitable purposes, such as gardening and air-cooling 
processes as provided for under Section 8 of this Act.  
SEC. 6. Requirements for Rainwater Management Plan. – All project 
owners or developers of proposed commercial, industrial, and residential 
development or any residential multi-dwelling units of more than one thousand 
square meters (1,000 sqm) land area must submit a Rainwater Management Plan 
(RMP) as part of the site development application and approval process. 
The RMP shall include the following information: 
(a) Description of existing conditions in the location of the development site: 
i. Topographic map with 1.0-meter minimum contours line or an 
appropriate contour interval of the land proposed for development or redevelopment; 
ii. Location of natural waterways including banks and centerline of 
streams and channels; 
iii. Normal shoreline, coastlines, outline of lakes, natural depressions and 
ponds, including drainage flow lines; and 
iv. Quantification of flows (discharge and volume) in its natural condition. 
(b) Proposed Site Development Plan (SDP) in an appropriate scale and size 
showing the following: 
i. Retention/detention basins and lines of inflow and outflow; 
ii. Location, size and slope of rainwater conduits and drainage swales; 
iii. Rain, sanitary and combined sewer and outfalls; 
iv.  Delineation of upstream and downstream drainage features and 
watersheds which might be affected by the development; and 


 
 
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v. Other environmental features including limits of wetland areas, green 
buffers, planting strips, and any designated natural areas for rainwater 
management. 
(c) Description of the proposed Rainwater Management System (RMS) to 
safely and completely manage rainwater runoff onsite or offsite, help maintain the 
natural hydrologic cycle and condition of flow in a locality and reduce the risk of 
downstream flooding. 
The proposed RMS shall be accompanied by hydrologic and hydraulic 
calculations to adequately demonstrate the effectiveness of the RMP. It shall be 
designed to meet the desired flood frequency which is designed to a particular 
drainage structure as stated in the Design Manual of the DPWH; Provided, That a 
25-year flood frequency or higher may be required for major rivers and waterways, 
subject to the design criteria in Section 9 of this Act. 
The RMP shall be accompanied by relevant information such as rainfall data in 
a locality, maps, and other descriptive material to include the following: 
(a) The extent of catchment and drainage channels on site, and direction of the 
flow of the channels including the final outfall of the discharge from the site; 
(b) Hydrologic and hydraulic design calculations for the predevelopment and 
post-development conditions of an RMS as required under Section 9 hereof. The 
calculations for determining peak flows include a description of storm frequency, 
intensity, duration, time of concentration, soil curve number or runoff coefficients, 
peak runoff rates and total runoff volumes, infiltration rates, culvert capacities, flow 
velocities, data on the increase in rate and volume of runoff for the design storm; and 
(c) Technical specifications of the proposed RMS, including a description of 
proposed rainwater conveyance practices on-site, existing off-site rainwater 
conveyance systems including receiving streams, channels, and outfall inlet locations, 
and elevations of locations and high-water elevations.  
SEC. 7. Chemicals, Effluents, and other Contaminants. – Prior to the 
issuance of a building permit for their development or re-development, all industrial 
plants and estates shall secure the appropriate certification from the DENR that all 


 
 
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chemicals used in their operations, their by-products effluents, and other operational 
discharges do not contain harmful contaminants that can be washed by or into the 
rainwater. 
The type of roofing must also be identified and assessed if used for collecting 
rainwater as some roofing materials may seep chemicals that can cause adverse 
effects if ingested, used in irrigation, fishponds, groundwater recharge, among others. 
SEC. 8. Utilization of Rainwater. – Rainwater shall be harvested for the 
following uses: 
(a)  Rainwater for urban irrigation – Due to the high cost of Class A water, 
its use for yard irrigation shall be minimized if not prohibited and instead, water for 
irrigation shall come from the rainwater detention system. 
Rainwater as a source of urban irrigation or watering of lawns shall be indicated 
in all development plans. Treated grey water from effluent of treatment facility may 
be a secondary source of water for urban irrigation. 
(b) Rainwater for underground recharge – The RMS is intended mainly to 
ensure the natural balance of hydrologic cycle by allowing rainwater to recharge the 
groundwater table that sustains the yield and production of wells. Groundwater table 
recharging may be in the form of the following management systems: 
i. 
Lagoons or retention pond that allows for natural seepage to the ground 
water aquifer; 
ii. Swales and depression storage; 
iii. Porous or paver blocks on some developed areas; and 
iv. Retention channels. 
The sizes and dimensions of any of the above facilities shall be dependent on the 
rainfall intensity and the size of the development. 
(c) Rainwater for firefighting – Rainwater may be substitute or augment the 
firefighting requirement, subject to health and corrosion standards. A separate 
storage tank for fire water reserve shall be constructed. Other laws concerning the 
requirement of water for firefighting shall be considered. 


 
 
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(d)  Rainwater for construction – Simple filtration systems and other 
applicable methods to remove suspended solids and other course materials may be 
employed to improve water quality and avert adverse effects to construction 
equipment and the environment. 
(e) Rainwater for other non-potable water supply – Rainwater shall be 
subjected to primary and secondary treatment to make it a viable secondary source 
for the following purposes: 
i. Washing of cars, floor yards; 
ii. Flushing of toilet (water quality should meet certain standards to avoid 
discoloration of fixtures); and 
iii. Fishponds, aquariums and the like. 
(f) Rainwater for potable uses – To make it potable, rainwater may be 
collected, processed, subjected to filtering innovations or technological interventions 
and used for drinking, cooking, dishwashing, and bathing, subject to water standards. 
Potable water quality shall at all times comply with the requirements and 
standards of the Philippine National Standard for Drinking Water (PNSDW). 
(g) Rainwater for ecological requirements – Seasonal fluctuation of rainfall 
affects the rain flora and fauna of waterways. Rainwater runoff shall therefore be 
managed properly to allow steady release of water to waterways, thus ensuring the 
continued supply of water. 
SEC. 9. Preparation of the Rainwater Design Manual. – The DPWH shall 
prepare the Rainwater Design Manual (RDM) which must provide, among others, 
information on the following: (1) conveyance system of the rainwater harvesting 
facility, (2) make of the rainwater retention facility, (3) management of rainwater 
discharge to  control flooding, (4) protection of the local water bodies from pollution 
through rainwater discharge treatment, (5) dike or bank protection for water bodies 
receiving rainwater discharge, and (6) utilization options for collected rainwater. 
The RDM shall contain the following guidelines: 
(a) All sites shall establish an RMS to control the peak flow rates of rainwater 
discharge and to allow RMS facility to treat collected rainwater for both quality and 


 
 
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quantity.  Peak post-construction rainwater runoff should not exceed peak pre-
construction rainwater runoff from the site to the greatest extent possible; 
(b) A structural and non-structural Rainwater Treatment System (RTS) shall 
be designed to treat the first 20 millimeters of rainwater runoff. 
 
Thus, for every one (1) hectare or new development, a 200 cubic meter 
detention or retention tank shall be constructed to minimize flooding and improve 
water quality. Sanitary wastewater treatment facilities shall be designed and 
installed to comply with existing health regulations and the effluent standard of the 
DENR. 
 
The integration of an RTS shall be dependent on the intended use of 
collected rainwater. Rainwater to be used for an urban irrigation, or underground 
recharge purposes, need no extensive purification process as against rainwater to be 
used for household or consumption. Furthermore, in practice, separation of the first 
flush or rainwater is performed to improve the quality of collected rainwater in the 
storage tank. 
(c) Untreated sanitary waste shall not be discharged to waterways and land 
surface without proper treatment and shall not come in contact with rainwater 
runoff. The discharge of treated effluent to water bodies shall be in accordance with 
the river classification. For unclassified rivers and water courses, effluents should 
meet the Class C water category. To be discharged to an urban drainage system, 
effluents should meet the Class D water category. In all cases, the prescription 
provided by the DENR shall be followed; 
(d) The velocity of runoff water shall be limited to less than 1.0m/s to protect 
stream channels from degradation; 
(e) Rainwater discharges to critical areas with sensitive resources (including 
shellfish beds, swimming areas, water supply reservoirs and groundwater recharge 
areas) may be subject to additional performance criteria and management 
restrictions; 


 
 
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(f) Rainwater discharges from land uses or activities with higher potential 
pollutants loadings, known as "hotspots," must be in accordance with the specific 
structural and pollution prevention practices; 
(g) Rainwater storage and draining systems must be secured from mosquito 
breeding and those of other similar insects that may endanger public health; 
(h) Prior to designing the RDM, an applicant for a building permit must consult 
with the Building Official, or in the absence of an Office of Building Official (OBO), 
the city or municipal engineering office, to determine compliance with additional 
rainwater design requirements; 
(i) For existing development or developed areas, the RMS requirement must be 
imposed on the following conditions: 
i. 
The total storage volume of rainwater may be the cumulative volume 
stored from various source such as cistern, lagoon onsite or offsite, and a depression 
storage; and 
ii. That at least 50% of the required volume shall be met within five (5) 
years from the effectivity of this Act. 
The DPWH, Department of Human Settlements and Urban Development 
(DHSUD), DENR, and LGUs concerned through its Building Official, or in the 
absence of an Office of Building Official (OBO), the city or municipal engineering 
office, shall require the incorporation of a RMS in the design of all new commercial, 
institutional, industrial, and residential development projects in Metro Manila. The 
LGUs shall ensure that these facilities are built during the construction phase of the 
projects. 
In formulating the design manual, the DPWH shall consult the experts of the 
Philippine Atmospheric, Geophysical, and Astronomical Services Administration 
(PAGASA) and DENR on requirements that entail scientific bases or study. 
SEC. 10. Design Approval. – The provision for a rainwater harvesting facility 
shall be required by the Building Official, or in the absence of an OBO, the city or 
municipal engineering office to be incorporated in the design of all new commercial, 
institutional, and residential development projects nationwide and no project design 


 
 
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shall be approved for construction unless it includes such facility. The Building 
Official, or in the absence of an OBO, the city or municipal engineer shall ensure that 
these facilities are built during the construction phase of the projects. 
 
The DPWH shall not approve designs of public buildings that do not contain 
rainwater harvesting and storage facilities. The Department shall also ensure that 
these are included in the actual construction of buildings. 
SEC. 11. Design Requirements. – The rainwater harvesting facility must be 
designed by a registered civil engineer to cope with a pre-determined flood and rain 
return period and must have a storage capacity prescribed by the DPWH. The design 
of the rainwater harvesting facility shall include the following: 
(a) Size, shape, and physical characteristics of available space; 
(b) Construction plans with specified material type, including lining and 
coating requirements; 
(c) Detailed drawing on how the installation will drain into an outfall structure 
such as a dry well or percolation chamber, storm drain system, drainage channel, or 
natural wash; and 
(d) Mechanism to exclude mosquitoes and not permit mosquito production. 
SEC. 12. Building Permits. – If the design of a new commercial, institutional, 
and residential development project with an area of at least one thousand square 
meters (1,000 sqm) does not provide for a rainwater harvesting facility, the LGU 
concerned through its Building Official, or in the absence of an OBO, the city or 
municipal engineering office, shall deny the request for issuance of a building permit 
for such project. 
SEC. 13. Construction Inspection. – 
(a) The applicant for a building permit must notify the concerned Building 
Official in advance before the commencement of construction; 
(b) All applicants for building permits for commercial buildings and multi-
family residential buildings over four (4) units are required to submit actual drawings 
of the rainwater management facilities located on-site after final construction. The 
rainwater facility plan must show the final design specifications for all rainwater 


 
 
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management facilities and must be certified by a licensed engineer. A final inspection 
of the rainwater facility is required before the release of any performance security, 
performance bond, or guaranty between the owner or developer and the contractor or 
builder; 
(c) The Building Official, or in the absence of an OBO, the City or Municipal 
Engineer shall inspect all drainage facilities while under construction. When 
facilities are not constructed according to approved plans, the LGU shall require the 
project owner or developer to make necessary corrections. All drainage facilities, 
whether or not these are owned by or assigned to the LGU, located on private 
property, shall be accessible at all times for inspection by the City or Municipal 
Engineer or other responsible public official; and 
(d) The Building Official, or in the absence of an OBO, City or Municipal 
Engineer shall inspect all sanitary waste treatment facilities while under 
construction of building and upon completion to insure proper installation and 
connection to wastewater collection systems when applicable. The City or Municipal 
Engineer shall ensure that sanitary waste treatment facilities are properly 
functioning before issuing the required certificate of occupancy. 
Any contracted architect or civil engineer employed by the owner or developer 
to plan and supervise the construction of the facility shall not be precluded from 
inspecting the construction work to check and determine compliance with the plans 
and specifications of the building, pursuant to the provisions under Inspection and 
Supervision of Work or Section 308 of the National Building Code of the Philippines. 
SEC. 14. Issuance of Certification. — The LGU concerned through its 
Building Official, or in the absence of an OBO, the city or municipal engineering 
office, after proper inspection, shall issue a certification that the owner of an existing 
institutional, commercial, industrial, and residential building has installed a 
rainwater collection system in the property. Such certification can be used as proof 
for tax credit purposes. 
SEC. 15. Maintenance and Repair of Rainwater Facilities. – The owner or 
developer is expected to perform regular maintenance and repair of the rainwater 


 
 
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facility whenever necessary to make sure that this is in working condition, safe for 
public use and the environment. At the minimum, the following must be undertaken: 
(1) visual inspection and cleaning of the facility after major rain events; (2) regular 
clearing of all sediments, silts, and debris; (3) drainage clean-up; and (4) replacement 
of filters and insect screens as necessary. 
In addition, the owner or developer shall comply with the following 
requirements: 
(a) All rainwater management facilities must undergo a yearly or regular 
inspection process at a frequency sufficient to determine the functioning ability of the 
conveyance system and any repair needs; this shall include inspection prior to the 
beginning of the typhoon season or any forecasted major rains that may equal the 
design requirements, and after any major rain events; 
(b) All drainage and sanitary waste treatment facilities located on private 
property whether dedicated to the LGU or not, shall be accessible at all times for 
inspection by the OBO, or in the absence of an OBO, the City or Municipal Engineer 
or other responsible public officials especially where there is reason to inspect that a 
malfunction has resulted in rainwater runoff pollution by unsanitary wastes; 
(c) Depending on the type of facility, mosquito or insect screens must be 
replaced as necessary to avoid infestation or breeding grounds for pathogens; 
(d) Parties responsible for the operation and maintenance of a rainwater 
management facility shall make and keep records of the installation, maintenance, 
and repairs, and shall retain these records for at least five (5) years. These records 
shall be made available to the city or municipality during inspection of the facility 
and other reasonable times upon request; and 
(e) The Building Official, or in the absence of an OBO, the City or Municipal 
Engineer, concerned shall notify the owner of the rainwater facility in writing that 
maintenance work is required on it. The owner will have sixty (60) days from the 
receipt thereof to ensure that the facility is in proper working condition. 
SEC. 16. Reportorial Requirements. – The Building Official, or in the absence 
of an OBO, the city or municipal engineering office, shall require the owner or 


 
 
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developer of all new institutional, commercial, industrial, and residential 
development projects covered under this Act to submit a compliance report within 12 
months from the date of the completion of the project and an annual report of the 
performance of such rainwater retention facility which may include, but is not limited 
to information on the total volume of retained rainwater and its utilization. The 
Building Official, or in the absence of an OBO, the city or municipal engineering 
office, shall provide the DPWH copies of these compliance and annual performance 
reports. 
The OBO, or in the absence of an OBO, the city or municipal engineering office, 
shall submit to the DPWH, through the National Building Code Development Office, 
an annual performance report on the compliance of owners or developers of all new 
institutional, commercial, industrial, and residential development projects. 
SEC. 17. Penalties. – The owner or developer of all new institutional, 
commercial, industrial, and residential development projects who fails to construct a 
rainwater harvesting facility in violation of Section 5 of this Act shall suffer the 
penalty of a fine of Two Million Pesos (P2,000,000.00) for every year of non-
compliance. The OBO shall not issue an occupancy permit to and shall cancel the 
business permit of the owner or developer of the development project. 
In the case of a partnership, association, corporation, or any juridical person, 
the fine shall be imposed upon the president, treasurer, or any other officer or person 
responsible for the violation. 
If the offender is a foreigner, the foreigner shall be deported immediately 
without further proceedings after payment of a fine. 
SEC. 18. Tax Incentives. — To encourage the public to promote the installation 
of rainwater collection system, the owner of an existing residential or commercial 
building who install a rainwater collection system in his/her property shall be entitled 
to a tax credit of 10% but not exceeding Ten Thousand Pesos (P10,000.00) of the total 
real property tax of the said property for a period of two (2) years. 
SEC. 19. Obligation of the Relevant Agencies. — The DPWH, DENR, 
DHSUD, PAGASA, LGUs, their sub-agencies, and subsidiaries are mandated to 


 
 
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provide full assistance to every project owner or developer covered in this Act in order 
that the requirements and standards prescribed herein may be properly executed in 
the design and construction of rainwater harvesting facilities. Agency assistance 
shall include proper advice, technical guidance, provision for needed data and 
facilitation of required documents. As much as practicable, all technical and 
documentation requirements must be at zero to minimal cost to the applicant project 
owner or developer who shall establish, manage, and maintain a rainwater 
harvesting facility. 
SEC. 20. Implementing Rules and Regulations. – Within sixty (60) days 
from the effectivity of this Act, the Secretary of Public Works and Highways, in 
coordination with the Secretaries of Interior and Local Government, Human 
Settlements and Urban Development, and Science and Technology, shall promulgate 
the rules and regulations for the effective implementation of this Act. The 
implementing rules and regulations (IRR) shall include the standards and guidelines 
for the design, construction, installation, materials, sites election and planning, site-
specific considerations, and maintenance of the rainwater harvesting facility. 
Likewise, the IRR of this Act shall also include operational provisions on issuance of 
permits and certifications as well as inspection of the rainwater harvesting facilities.  
SEC. 21. Separability Clause. – If any provision or part of this Act is declared 
unconstitutional or invalid, other parts or provisions hereof not affected thereby shall 
continue to be in full force and effect. 
SEC. 22. Repealing Clause. – All other laws, decrees, orders, rules and 
regulations or parts thereof inconsistent with this Act are hereby repealed or 
amended accordingly. 
SEC. 23. Effectivity Clause. – This Act shall take effect fifteen (15) days after 
its publication in the Official Gazette or in a newspaper of general circulation.  
Approved,