Results of State DOT Process Water Positions
February 24, 2016| State | Use Process Water? (Y or N) | Comments |
|---|---|---|
| Alabama | No | |
| Alaska | ||
| Arizona | ||
| Arkansas | ||
| California | Yes | Specific gravity of 1.04 with a tolerance of +/- .01. So a specific gravity of 1.05 would be acceptable. Project Engineer has final approval. |
| Colorado | ||
| Connecticut | ||
| Delaware | ||
| District of Columbia | No | |
| Florida | No | Florida DOT only allows for moisture conditioning of aggregates for production of 347 non-structural concrete. |
| Georgia | Yes | Recycled water has to meet all of AASHTO M 157 but is allowed. |
| Hawaii | Yes | 712.01 Water. Water shall conform to AASHTO M 157, Section 4.1.4 for mixing and curing concrete, mortar and grout. Potable water requires no testing. Recycled water from mixer wash may be used for mixing concrete if recycling is achieved by dilution. Under this process, extensive dilution and continuous agitation keep solids in a state of suspension. Water reclaimed in this manner shall not contain coloring agents or more than 300 parts per million of alkalis (Na2O plus 0.658K20) as determined by filtration. Specific gravity of recycled wash water shall not exceed 1.03 plus or minus 0.01. Use of recycled water shall be discontinued if there is undesirable reaction with admixtures or aggregates. Water that has been reclaimed by concentration will not be allowed for use. |
| Idaho | ||
| Illinois | No | We are working with the Illinois DOT currently towards allowing up to 25% clarified washwater in Ready Mixed Concrete. |
| Indiana | No | |
| Iowa | No | |
| Kansas | No | |
| Kentucky | No | other similar materials that is reasonably clean and free from oil, salt, acid, alkali, sugar, vegetable, or other substances injurious to the finished product. The Engineer may test the water at any time for its suitability for a particular use. The Engineer will ordinarily accept water supplied by public distribution systems without testing. The Engineer will require testing of mixing water for use in concrete when not from a public distribution system. Provide water that when tested by KM 64-226 does not contain impurities in excess of the following limits: Acidity or Alkalinity Calculated 0.05 Percent in terms of Calcium Carbonate Total Organic Solids 0.10 Percent Total Inorganic Solids 0.10 Percent Chloride Content (as Cl) 1,000 parts per million |
| Louisiana | ||
| Maine | ||
| Maryland | No | |
| Massachusetts | ||
| Michigan | ||
| Minnesota | No | |
| Mississippi | No | |
| Missouri | ||
| Montana | ||
| Nebraska | Yes | I couldn't find any verbiage within the spec book but I have been told the NDOR allows up to 10% process water....but has to adhere to the following.... Water which contains more than 0.25 percent total solids by weight shall not be used. When required by the Engineer, the quality of mixing water shall be determined by AASHTO T 26. |
| Nevada | No | |
| New Hampshire | ||
| New Jersey | No | |
| New Mexico | ||
| New York | ||
| North Carolina | Yes | In North Carolina, from the September 1998 meeting with NCDOT M & T states that recycled water may be used if it meets the requirements of C 94. In recent conversation with the Department they clarified that they do not distinguish any water source from another, as long as it can meet the requirements of C 94. So, if one was to process their gray water until it met the requirements for potable water, and had the test results to prove it, then in theory, you are free to batch with it. |
| North Dakota | ||
| Ohio | Yes | Water from Mixer wash out operations may be used in mixing concrete providing it is: Within the limits of ASTM C 94 Table 1 Acceptable criteria for questionable water supplies.and ASTM C 94 Table 2, Chemical limitations for wash water. In addtion the maximum specific gravity limit is 1.03. |
| Oklahoma | ||
| Oregon | Yes | Water from Mixer wash out operations may be used in mixing concrete providing it is: Within the limits of ASTM C 94 Table 1 Acceptable criteria for questionable water supplies.and ASTM C 94 Table 2, Chemical limitations for wash water. In addtion the maximum specific gravity limit is 1.03. |
| Pennsylvania | No | |
| Puerto Rico | ||
| Rhode Island | ||
| South Carolina | Yes | In South Carolina, batching structural concrete that incorporates captured process water is prohibited. However, SCDOT does permit its use in non-reinforced concrete applications, such as curb & gutter, sidewalks, and slope protection. If a producer wishes to incorporate this practice, a specific gravity must be run on a sample and it may not exceed the state's limit. I do not remember what that limit is. The producer must also run set tests against control samples made with potable water and do strength comparisons. It was recently approved that those strength tests may be made with concrete cylinders instead of cubes. Once again, I do not remember the frequency requirements for testing to meet SCDOT expectations, but you get the gist. |
| South Dakota | No | Water used in Portland Cement concrete and cement stabilization shall be clean and free of oil, salt, acid, alkali, sugar, vegetation, effluent from a sewage disposal plant, and other substances detrimental to the finished product. Water containing suspended matter shall be checked for turbitdity. The suspended sloid shall not exceed 2000 parts per million. Water shall be tested for pH and dissolved solids. The pH shall be no less than 6.0 or no more than 8.6. Maximum dissolved solids shall be no more than 2500 parts per million. Should either the pH or dissolved solids test fail to meet requirements, the Engineer may request further tests be made accoding to Section 3.4 of AASHTO T 26. Testing: Turbidity SD 414 Dissolved Sloids SD 415 pH Manufacturers Instructions w/Meter |
| Tennessee | Yes | TDOT allows recycled water, however, it has to be tested in accordancewith AASHTO T 26. |
| Texas | No | |
| Utah | ||
| Vermont | ||
| Virginia | ||
| Washington | Yes | WSDOT Standard Specification 9-25.1 Water for Concrete requires that in order to use recycled water the lab that tests their water must meet R-18. No one is currently using recycled water because of the R-18 requirement. Proposed changes to WSDOT Standard Specification 9-25.1 Water for Concrete. The proposal eliminates the requirement for AASHTO R-18 laboratory certification. Kurt stated that WSDOT will review the proposal internally. NOT CHANGED AS OF END OF YEAR. WILL REVISIT WITH WACA AND LET YOU KNOW IF ANY CHANGES ARE FORTHCOMNIG |
| West Virginia | No | |
| Wisconsin | Yes | They do NOT specify against GREY water BUT you must prove to them BEFORE the job starts In other words, multiple tests would be advised showing them the source meets criteria It starts on page 214 of DOT Spec for 2012 |
| Wyoming |
See something that’s not quite right with our state-by-state listing of DOT positions on process water? Please contact us so we can correct it.