Water Quality in Walla Walla, WA (99362)
EPA violation data for public water systems serving ZIP code 99362.
Active Health Violations
5 health-based violations found in the past 5 years, with at least one still unresolved. Contaminant levels have exceeded federal safety limits. Consider testing your tap water independently.
More violations than 99% of US ZIP codes.
Based on EPA compliance data. Not a substitute for an official water quality report from your utility.
42,853
Population
62
Water Systems
205
Violations (5yr)
5
Health-Based
Location
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Water Systems Serving This Area (62)
Walla Walla Water Division
All resolved Surface water 42,959 people served
16 violations (5yr)
· All resolved
Hermiston, City Of
All resolved Surface water 20,000 people served
6 violations (5yr)
· All resolved
Pendleton, City Of
All resolved Surface water 16,996 people served
6 violations (5yr)
· All resolved
Lead tested: 2.5 ppb (limit: 15 ppb) ✓
College Place Water Dept
All resolved Groundwater 8,147 people served
100 violations (5yr)
· All resolved
Washington State Penitentiary
Groundwater 3,278 people served
0 violations
Consolidated Irrigation Dist 14
Groundwater 1,555 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Walla Walla University
All resolved Groundwater 1,273 people served
3 violations (5yr)
· All resolved
Valle Lindo Homes
Groundwater 787 people served
0 violations
Green Tank Irr District 11
Groundwater 553 people served
0 violations
Prescott Town Of
All resolved Groundwater 522 people served
1 violation (5yr)
· All resolved
Touchet School
Groundwater 303 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Walla Walla Airport
Groundwater 280 people served
0 violations
Hydro Irrigation District No 9
Groundwater 252 people served
0 violations
Blalock Orchard Dist 10
All resolved Groundwater 250 people served
1 violation (5yr)
· All resolved
Lead tested: 0 ppb (limit: 15 ppb) ✓
Dixie Water Association
1 health-based Groundwater 240 people served
1 violation (5yr)
· 1 health-based · All resolved
Lead tested: 0 ppb (limit: 15 ppb) ✓
Rooks Park Water
Groundwater 201 people served
0 violations
Blalock Orchards Dist 12
Purchased groundwater 193 people served
0 violations
Lead tested: 3 ppb (limit: 15 ppb) ✓
Bennington Lake
Groundwater 150 people served
0 violations
Klicker Water System 1
Purchased surface water 134 people served
0 violations
Whitman Mission National Historic
Groundwater 134 people served
0 violations
Sydney Heights Water Assn
All resolved Groundwater 130 people served
11 violations (5yr)
· All resolved
Lead tested: 0 ppb (limit: 15 ppb) ✓
New Life Comm. Assembly Of God
Groundwater 130 people served
0 violations
Coe Mcnary Dam
All resolved Groundwater 120 people served
4 violations (5yr)
· All resolved
Columbia12 Touchet Chevron
4 health-based Groundwater 104 people served
12 violations (5yr)
· 4 health-based · All resolved
Stateline Jackpot
Groundwater 100 people served
0 violations
Summers Circle Water Llc
Groundwater 82 people served
0 violations
Walla Walla River Packing & Storage
Groundwater 75 people served
0 violations
Wine Valley Water System
All resolved Groundwater 71 people served
1 violation (5yr)
· All resolved
Mill Creek Project Office
All resolved Groundwater 50 people served
1 violation (5yr)
· All resolved
Kooskooskie Cabin Owners Inc.
All resolved Groundwater 45 people served
30 violations (5yr)
· All resolved
Prospect Heights Comm Water Assn
Groundwater 40 people served
0 violations
Lead tested: 15 ppb (limit: 15 ppb)
Usfs Jubilee Lake Cg
Groundwater 40 people served
3 violations (5yr)
Cameo Heights
All resolved Groundwater 35 people served
9 violations (5yr)
· All resolved
Prospect Point Grange
Groundwater 35 people served
0 violations
Walla Walla Yacht Club
Groundwater 34 people served
0 violations
Three Rivers Winery
Groundwater 32 people served
0 violations
St. Basils Academy
Groundwater 30 people served
0 violations
Reser Creek Water System
Groundwater 26 people served
0 violations
Byerley Farms
Groundwater 25 people served
0 violations
Indian Campground
Groundwater 25 people served
0 violations
Table Rock Lookout
Groundwater 25 people served
0 violations
Idaho Light Industrial
Groundwater 25 people served
0 violations
Lead tested: 0 ppb (limit: 15 ppb) ✓
Pleasant View Nursing Home
Groundwater 23 people served
0 violations
Neuffer Water System
Groundwater 20 people served
0 violations
Burbank West Way
Groundwater 20 people served
0 violations
Mill Creek Glen
Groundwater 16 people served
0 violations
Spring Valley Vineyard
Groundwater 10 people served
0 violations
Glen Fiona Winery
Groundwater 5 people served
0 violations
Country Garden Elem. School
Groundwater 5 people served
0 violations
Walla Walla Livestock Auction
Groundwater 5 people served
0 violations
Pepper Bridge Winery
Groundwater 4 people served
0 violations
Bodega Turner Winery
Groundwater 4 people served
0 violations
Isenhower Cellars
Groundwater 3 people served
0 violations
Bowe Water System
Groundwater 3 people served
0 violations
La Frontera Water System
Groundwater 3 people served
0 violations
Paris Water System
Groundwater 3 people served
0 violations
Waliser Water System
Groundwater 3 people served
0 violations
Lopez, Bernardo Water System
Groundwater 3 people served
0 violations
Rulo Winery
Groundwater 2 people served
0 violations
Saviah Cellars
Groundwater 2 people served
0 violations
K Vintners
Groundwater 1 people served
0 violations
Walla Walla Vintners
Groundwater 1 people served
0 violations
Contaminants Found
NitrateHealth-Based
At high levels, nitrate can cause blue baby syndrome in infants.
16 violations
All resolved
Revised Total Coliform RuleHealth-Based
Missed testing deadlines — not a detection of bacteria.
13 violations
All resolved
2,4,5-TPMonitoring
9 violations
All resolved
DalaponMonitoring
9 violations
All resolved
PicloramMonitoring
9 violations
All resolved
DinosebMonitoring
9 violations
All resolved
PentachlorophenolMonitoring
9 violations
All resolved
Consumer Confidence RuleMonitoring
Annual water quality report delivery requirement.
5 violations
All resolved
COLIPHAGEMonitoring
4 violations
All resolved
1,2,4-TrichlorobenzeneMonitoring
4 violations
All resolved
BenzeneMonitoring
4 violations
All resolved
1,1,2-TrichloroethaneMonitoring
4 violations
All resolved
DICHLOROMETHANEMonitoring
4 violations
All resolved
CHLOROBENZENEMonitoring
4 violations
All resolved
TrichloroethyleneMonitoring
4 violations
All resolved
EthylbenzeneMonitoring
4 violations
All resolved
o-DichlorobenzeneMonitoring
4 violations
All resolved
TolueneMonitoring
4 violations
All resolved
TetrachloroethyleneMonitoring
4 violations
All resolved
1,2-DichloropropaneMonitoring
4 violations
All resolved
p-DichlorobenzeneMonitoring
4 violations
All resolved
cis-1,2-DichloroethyleneMonitoring
4 violations
All resolved
trans-1,2-DichloroethyleneMonitoring
4 violations
All resolved
1,1,1-TrichloroethaneMonitoring
4 violations
All resolved
1,1-DichloroethyleneMonitoring
4 violations
All resolved
1,2-DichloroethaneMonitoring
4 violations
All resolved
Vinyl chlorideMonitoring
4 violations
All resolved
Carbon tetrachlorideMonitoring
4 violations
All resolved
StyreneMonitoring
4 violations
All resolved
TTHMMonitoring
3 violations
All resolved
Total Haloacetic Acids (HAA5)Monitoring
3 violations
All resolved
Di(2-ethylhexyl) adipateMonitoring
2 violations
All resolved
SimazineMonitoring
2 violations
All resolved
HEXACHLOROBENZENEMonitoring
2 violations
All resolved
ToxapheneMonitoring
2 violations
All resolved
LASSOMonitoring
2 violations
All resolved
Heptachlor epoxideMonitoring
2 violations
All resolved
Di(2-ethylhexyl) phthalateMonitoring
2 violations
All resolved
HeptachlorMonitoring
2 violations
All resolved
BHC-GAMMAMonitoring
2 violations
All resolved
EndrinMonitoring
2 violations
All resolved
ChlordaneMonitoring
2 violations
All resolved
Benzo(a)pyreneMonitoring
2 violations
All resolved
AtrazineMonitoring
2 violations
All resolved
MethoxychlorMonitoring
2 violations
All resolved
HexachlorocyclopentadieneMonitoring
2 violations
All resolved
E. COLIMonitoring
2 violations
Has active
Lead & Copper Levels
Lead (Pb)
Within limit0 ppb measured
Action level: 15 ppb
Sampled: Jul 2025
How Does This Compare?
Walla Walla (99362) has more violations than 99% of US ZIP codes. The national average is 18.87 violations per ZIP over 5 years. This ZIP has 205.
Fewer violations 99th percentile More violations
Recommended Water Filters
Based on health-based violations detected in your area, these filter types are commonly used to address similar contaminants. Consult your water utility's Consumer Confidence Report for the most current data.
Reverse Osmosis System
One of the few filtration methods effective at removing nitrates and nitrites. Essential for households with infants.
Targets:Nitrate, Nitrite, Dissolved Solids
Look for:NSF/ANSI 58 certified
UV Water Purifier
Uses ultraviolet light to neutralize bacteria, viruses, and parasites without chemicals. Ideal for homes with microbial contamination concerns.
Targets:E. coli, Coliform, Giardia, Cryptosporidium
Look for:NSF/ANSI 55 (Class A) certified
Always look for filters certified by NSF International for the specific contaminants you want to remove. This is general educational information, not an endorsement of any specific product.