REPUBLIC OF THE PHILIPPINES 
HOUSE OF REPRESENTATIVES 
Quezon City 
TWENTIETH CONGRESS 
First Regular Session 
House Bill No. __________ 
Introduced by HONORABLE RAMON JOLO B. REVILLA III, 
HONORABLE LANI MERCADO-REVILLA, and 
 HONORABLE BRYAN B. REVILLA 
EXPLANATORY NOTE 
This bill intends to require the installation of gray water treatment systems in 
buildings to promote the utilization of alternative sources of water. It shall mandate 
every building owner with 1,000 square meters of floor area to a gray water treatment 
system with sufficient capacity to treat all gray water produced in the said building. 
Greywater, also known as sullage, refers to untreated household wastewater 
generated from sources such as sinks, showers, baths, washing machines, and 
dishwashers. It can be reused onsite for various non-potable purposes such as toilet 
flushing, landscape, or crop irrigation. In promoting its usage, we can greatly reduce 
the demand for freshwater thus conserving our water supply systems. Moreover, 
reusing greywater holds significant economic benefits for consumers since it will 
lead to cost savings and less strain on water resources. 
August 11, 2025
2:04 pm
3444


Section 16, Article II of the 1987 Constitution provides that the “State shall 
protect and advance the right of the people to a balanced and healthful ecology in 
accordance with the rhythm and harmony of nature.” It is, therefore, fervent to 
emphasize the utilization of alternative sources of water such as greywater to reduce 
freshwater demand and help in water conservation. 
In view of the foregoing, the immediate passage of this bill is earnestly sought. 
     RAMON JOLO B. REVILLA III 
LANI MERCADO-REVILLA 
BRYAN B. REVILLA 


REPUBLIC OF THE PHILIPPINES 
HOUSE OF REPRESENTATIVES 
Quezon City 
TWENTIETH CONGRESS 
First Regular Session 
House Bill No. __________ 
Introduced by HONORABLE RAMON JOLO B. REVILLA III, 
HONORABLE LANI MERCADO-REVILLA, and 
 HONORABLE BRYAN B. REVILLA 
AN ACT  
MANDATING THE INSTALLATION OF GRAY WATER TREATMENT 
SYSTEMS IN BUILDINGS AND IMPOSING PENALTIES FOR 
VIOLATIONS THEREOF 
Be it enacted by the Senate and House of Representatives of the Philippines in 
Congress assembled: 
SECTION 1. Title. – This Act shall be known as the “Gray Water Treatment
1 
and Reuse Act.” 
2 
3 
SEC. 2. Declaration of Policy. – It is hereby declared the policy of the State 
4 
to converse, to the fullest extent possible, its water resources by proactively 
5 
promoting the utilization of alternative sources of water. In line with this, the State 
6 
shall ensure that all buildings within its territory are properly equipped with 
7 
treatment facilities and systems that will enable them to efficiently maximize the use 
8 
of the water sources at their disposal. 
9 
3444


 
SEC. 3. Definition of Terms. – As used in this Act, the following terms shall 
1 
mean: 
2 
 
3 
(a) Gray water refers to wastewater which, though not potable, is understood 
4 
as not pathologically infectious and is not contaminated with fecal matter, 
5 
which may be used for watering plants, laundry, flushing toilets, cleaning, 
6 
and other uses not related to human consumption; 
7 
 
8 
(b) Gray water treatment system refers to any appliance, equipment, or 
9 
combination thereof designed to remove pathogens from gray water and 
10 
render the same suitable for reuse on-site in toilets, urinals, or subterranean 
11 
irrigation system; 
12 
 
13 
(c) Blackwater refers to wastewater that has been contaminated with fecal 
14 
matter; and 
15 
 
16 
(d) Building refers to any structure for the support, shelter, or enclosure, as 
17 
defined by Republic Act No. 6541, otherwise known as the “National 
18 
Building Code of the Philippines,” as amended, of persons, animals, 
19 
chattels, or property of any kind.  
20 
 
21 
SEC. 4. Installation of Gray Water Treatment Systems in All Buildings. – 
22 
Within one (1) year from the effectivity of this Act, every owner of a building with 
23 
a floor area of at least One thousand (1,000) square meters shall install a gray water 
24 
treatment system with sufficient capacity to treat all gray water produced in the said 
25 
building. 
26 
 


Upon request by an owner of a building with a floor area of less than One 
1 
thousand (1,000) square meters, the water utility servicing such building shall install 
2 
therein a gray water treatment system with a capacity sufficient to treat all of the 
3 
gray water produced in the said building. The costs of the system and its installation 
4 
shall be borne by the owner of the building and, at the option of the building owner, 
5 
may be repaid in installments to be included in the monthly bill; Provided however, 
6 
That each installment shall not exceed more than Ten per centum (10%) of the 
7 
monthly bill. 
8 
 
9 
 
SEC. 5. Inclusion of a Gray Water System in Building Plans and 
10 
Specifications. – Upon effectivity of this Act, no building with a floor area of at least 
11 
One thousand (1,000) square meters shall be permitted for construction unless the 
12 
plans and specifications therefor provide for a gray water system with a capacity 
13 
sufficient to treat all gray water produced in the contemplated building. Should the 
14 
completed building fail to comply with such plans and specifications, the same shall 
15 
not be permitted for occupancy and/or operation. 
16 
 
 
SEC. 6. Reuse of Gray Water. – Treat gray water shall not be reused for 
17 
human consumption or for any purpose other than on-site in toilets, urinals, and 
18 
subterranean irrigation. 
19 
 
20 
SEC. 7. Storage and Commingling with Other Water Sources. – Gray water, 
21 
whether treated or untreated shall not be commingled with potable sources of water 
22 
fir for human consumption. For entities who collect rainwater, only treated gray 
23 
water may be commingled with such rainwater subject to rules and regulations of 
24 
appropriate government agencies. 
25 
 


SEC. 8. Implementation and Oversight. – The implementation and oversight 
1 
of this Act, including the enforcement of provisions related to the installation and 
2 
maintenance of gray water treatment systems and facilities in buildings, shall be the 
3 
responsibility of the Water Resource Management Office (WRMO) under the 
4 
Department of Environment and Natural Resources (DENR). Further, That the 
5 
WRMO shall: 
6 
 
7 
(1) Develop and issue guidelines and standards for the installation, operation, 
8 
and maintenance of gray water treatment system in buildings; and 
9 
 
10 
(2) Conduct inspections to ensure compliance with this Act and its 
11 
implementing rules and regulations. 
12 
 
13 
SEC. 9. Penalty Provisions. – [The penalty of six (6) months and one (1) day 
14 
to one (1) year imprisonment;] A fine of not less than [Fifty thousand pesos 
15 
(P50,000.00)] One hundred thousand pesos, but not more than [One hundred 
16 
thousand pesos (P100,000.00)] Five hundred thousand pesos (P500,000.00), at the 
17 
discretion of the court shall be imposed upon: 
18 
 
19 
(a) Any owner of a building who fails to install a gray water system, as 
20 
provided for under the first paragraph of Section 4 of this Act. In 
21 
case the owner is a partnership or a corporation, the penalty shall be 
22 
imposed upon the responsible partners or members of the board; 
23 
 
24 
(b) The proprietor, responsible partners, or responsible members of the 
25 
board of water utilities which shall refuse to install a gray water 
26 


system, as provided for under the second paragraph of Section 4 
1 
hereof; 
2 
 
(c) Any government official or employee who shall permit the building 
3 
or occupancy of any building in violation of Section 5 hereof; and 
4 
 
5 
(d) Any person who stores and reuses gray water in violation of 
6 
Sections 6 and 7 of this Act. 
7 
 
8 
SEC. 10. Separability Clause. – If any provision or part of this Act is declared 
9 
invalid or unconstitutional, the remaining provisions or parts of this act shall remain 
10 
in full force and effect, and the application of such provision to other persons or 
11 
circumstances shall not be affected. 
12 
 
13 
SEC. 11. Repealing Clause. – All laws, orders, issuances, rules, and 
14 
regulations or parts thereof inconsistent with the provisions of this Act are hereby 
15 
repealed, amended, or modified accordingly. 
16 
 
SEC. 12. Effectivity. – This Act shall take effect fifteen (15) days after its 
17 
publication in the Official Gazette or in a newspaper of general circulation.  
18 
 
Approved,