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IDAHO
Population: 1,293,953

Information on the state of Idaho is available for the following topics. To review this information, click on the links below.

Contacts| Regulations, Statutes & State Codes | Quick Facts | Septic Stats

Onsite Demonstration Programs | Onsite Management Communities

 

 

Contacts:
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Barry Burnell, EHS Life Sciences Discipline Lead or
Mike Thomas, Ground Water Program Analyst
Idaho Department of Health and Welfare
Division of Environmental Quality
1410 North Hilton
Boise, Idaho 83706
(208) 373-0539 or (208) 373-0381, respectively
(208) 373-0143 (fax)

bburnell@deq.state.id.us

mthomas@deq.state.id.us

http://www2.state.id.us/adm/adminrules/rules/idapa58/0103.pdf

 

Regulations, Statutes & State Codes:
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Idaho State Regulations

Idaho Constitutions, Statutes and Codes

Rules for Individual/Subsurface Sewage Systems
IDAPA 16, Title 01, Chapter 03
July 1993

Technical Guidance Manual
for Individual and Subsurface Sewage Disposal Systems
July 18, 1995

These regulations are current and are not presently under revision; however, the Technical Guidance Committee (TGC) is preparing draft rules. Rulemaking is being considered for 2002.

For a list of technologies that are approved for use in Idaho, see the Technical Guidance Manual for Individual and Subsurface Sewage Disposal (TGM) at www2.state.id.us/deq/waste/tgm_sewage.htm The TGM lists all of the state-adopted alternative systems. The state has three experimental systems under consideration: two (2) constructed wetlands, and one drip irrigation system. These were approved for construction under the experimental section of the TGM. Two additional constructed wetlands are proposed for construction this next year. Experimental systems may be approved under the Experimental System Section of the TGM.

Surface discharge is not allowed for onsite systems in Idaho.

In regard to drainfield area/size reductions, the TGM, as a state-of-the-art technical manual, allows for drainfield size reductions for systems that provide treatment equal to intermittent sand filters. Drainfields from intermittent sand filters are one-fourth to one-third the size of a standard drainfield. This is based on wastewater pretreatment via a sand filter and the discharge of a highly treated effluent.

The TGC has recommended to the Department of Environmental Quality (DEQ), and the DEQ has accepted, reduced drainfields for gravelless trench components. Currently, the Idaho DEQ and TGC are reviewing the sizing methodology for gravelless systems. These reductions were based on manufacturer recommendations. Intermittent sand filters, recirculating gravel filters, extended treatment package systems, and gravelless trench components are considered for drainfield reductions in Idaho.

No funding program or mechanism exists to assist homeowners replacing failing systems or installing new systems, and there are no plans to develop one within the next year.

Currently, no onsite wastewater demonstration, research, or testing projects are ongoing in the state.

Idaho State Code does not recognize or require management programs/contracts or management districts to monitor and maintain onsite systems or individual liquid waste systems. The regulations are very specific for standard drainfields. The TGM requires operation and maintenance entities for all extended treatment package systems. A local county ordinance (Blaine County) requires all complex systems to be inspected by a qualified inspected every three years.

The local district health departments implement the onsite program as delegated from the DEQ and have authority to adopt rules and regulations to protect health and safety of the public. The district health departments or local agencies could adopt maintenance/management programs. The State has adopted a program.

Permits issued per year for new construction (4,588 in CY1999) and system replacement (1,560 in CY1999) are tracked by the State. These records are maintained at the local level.

In Idaho, a failed system is any system that exhibits one or more of the following characteristics (see IDAPA 58.01.03.003.13. Failing System):
· System does not meet the intent of the regulations as stated in subsection 01.03.004.01.
· System fails to accept blackwaste or wastewater.
· System discharges blackwaste or wastewater into waters of the state or onto the ground surface.
The most common reason for system failure has been undersized gravelless trench systems, excessive water use, and lack of maintenance.

Idaho has a licensing/certification program for onsite wastewater professionals. In Idaho, Environmental Health Specialists perform site inspections and site evaluations. Engineers, certified soil scientists, and hydrologists may be hired as consultants to assist property owners in preparation of their application for a subsurface sewage permit.

For information relevant to municipal wastewater guidelines, please contact Rick Huddleston, P.E., Wastewater Program Manager, Idaho DEQ, by phone at (208) 373-0561 or by email at rhuddles@deq.state.id.us

Quick Facts:
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Total number of onsite systems: 1990 U.S. census reports 143,000, said to be about 36% of
households.

Number of new systems installed each year: 7000.

Failure definition: Any system that fails to accept black waste or wastewater, that discharges
wastewater into ground- or surface waters, or that does not meet the intent of the regulations.

Number or proportion of systems presently failing: About 15%.

Number or proportion repaired annually: 5-15% of systems are either repaired or replaced
annually.

Number or proportion replaced annually: See above.

Number or proportion of repairs or replacements that require alternative technology (e.g.,
sand filters, pressure dosing):
Approximately 10%.

Number or proportion of repairs or replacements that require advanced technology (e.g.,
disinfection, nutrient removal):
Very few, if any.

Cost of a conventional septic system installation: $2000-2600 (range $1000-$20,000, the low
applying only to drainfield replacement, the high to recirculating sand filters with pressure-dosed
drainfields).

Cost of a centralized sewer tie-in (including fees and cost of the sewer lateral): $1000-$4000.

 

Septic Stats:
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TOTAL PERSONS TOTAL HOUSING UNITS PUBLIC SYSTEM DRILLED WELL DUG WELL OTHER PUBLIC SEWER SEPTIC TANK OTHER MEANS
IDAHO 1,006,749 413,327 289,502 105,860 6,473 11,492 264,618 142,879 5,830
COUNTIES
ADA 205,775 80,849 67,931 12,314 455 149 64,782 15,886 181
ADAMS 3,254 1,778 763 837 41 137 743 975 60
BANNOCK 66,026 25,694 22,631 2,756 125 182 22,061 3,552 81
BEAR LAKE 6,084 2,934 2,188 508 76 162 2,000 880 54
BENEWAH 7,937 3,731 2,313 855 98 465 2,016 1,392 323
BINGHAM 37,583 12,664 6,297 6,165 137 65 5,980 6,517 167
BLAINE 13,552 9,500 6,795 2,499 170 36 6,348 3,020 132
BOISE 3,509 2,894 1,134 1,141 181 438 529 2,317 48
BONNER 26,622 15,152 6,910 5,343 1,104 1,795 5,287 9,320 545
BONNEVILLE 72,207 26,049 21,270 4,546 56 177 21,245 4,673 131
BOUNDARY 8,332 3,242 2,231 363 265 383 1,182 1,898 162
BUTTE 2,918 1,265 680 571 11 3 599 644 22
CAMAS 727 481 191 255 21 14 194 263 24
CANYON 90,076 33,137 21,407 11,302 322 106 19,825 13,130 182
CARIBOU 6,963 2,867 1,992 625 25 225 1,826 1,026 15
CASSIA 19,532 7,212 3,977 3,040 90 105 3,551 3,545 116
CLARK 762 502 207 219 8 68 7 403 92
CLEARWATER 8,505 3,805 2,410 807 103 485 2,483 1,218 104
CUSTER 4,133 2,437 938 1,213 66 220 1,001 1,281 155
ELMORE 21,205 8,430 6,194 1,944 149 143 5,884 2,438 108
FRANKLIN 9,232 3,240 2,403 335 56 446 1,537 1,667 36
FREMONT 10,937 5,961 2,579 3,214 145 23 2,322 3,341 298
GEM 11,844 4,725 1,839 2,691 103 92 1,980 2,726 19
GOODING 11,633 4,800 2,662 1,809 92 237 2,413 2,346 41
IDAHO 13,783 6,346 3,169 1,911 174 1,092 2,972 2,999 375
JEFFERSON 16,543 5,353 1,576 3,612 121 44 1,647 3,621 85
JEROME 15,138 5,886 3,279 2,548 31 28 3,073 2,756 57
KOOTENAI 69,795 31,964 25,547 4,516 376 1,525 14,644 16,925 395
LATAH 30,617 11,870 8,775 2,552 243 300 8,828 2,738 304
LEMHI 6,899 3,752 1,607 1,605 101 439 1,502 1,909 341
LEWIS 3,516 1,681 1,263 327 32 59 1,167 455 59
LINCOLN 3,308 1,386 802 570 9 5 740 628 18
MADISON 23,674 6,133 3,941 2,118 74 0 3,871 2,235 27
MINIDOKA 19,361 7,044 3,681 3,096 258 9 3,757 3,126 161
NEZ PERCE 33,754 14,463 12,825 1,092 136 410 12,127 2,174 162
ONEIDA 3,492 1,496 887 486 58 65 845 627 24
OWYHEEE 8,392 3,332 1,569 1,584 33 146 1,458 1,743 131
PAYETTE 16,434 6,520 3,858 2,588 45 29 3,912 2,576 32
POWER 7,086 2,701 1,703 950 27 21 1,570 1,102 29
SHOSHONE 13,931 6,923 5,690 440 272 521 5,711 1,043 169
TETON 3,439 1,645 689 835 26 95 503 1,119 23
TWIN FALLS 53,580 21,158 14,666 6,013 355 124 14,704 6,355 99
VALLEY 6,109 6,640 3,769 2,387 146 338 3,642 2,777 221
WASHINGTON 8,550 3,685 2,264 1,278 57 86 2,150 1,513 22

 

Onsite Demonstration Programs:
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No information available on Onsite Demonstration Programs in Idaho.

Onsite Management Communities:
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Dalton Gardens/Sun Valley