Tap and WellTreasure Valley water, from the public record

City of Kuna water quality

Met every federal limit. 2 contaminants at half a limit or higher. Hard, 8 gpg.

ID4010085. Data through 2026-08-13. DEQ record.

Drink it as-is? Meets limits, 2 to watch Arsenic and Nitrate (as N). Soften the whole house? Hard water 8 gpg. A softener is the usual fix. Lead at the tap? Not detected in sampled homes Sampled homes, not your tap.

What's in it

Arsenic

Elevated
6.8ppb of 10.0ppb federal limit

Aquasana OptimH2O Reverse Osmosis + Claryum is certified to reduce it.

Nitrate (as N)

Elevated
5.00ppm of 10.00ppm federal limit

EPA: infants below the age of six months who drink water containing nitrate in excess of the MCL could become seriously ill and, if untreated, may die.

Aquasana OptimH2O Reverse Osmosis + Claryum is certified to reduce it.

14 other contaminants tested, not detected or well below the limit

Copper 0.06ppm Fluoride 1.13ppm Gross Alpha 16.4pCi/L Haloacetic Acids (HAA5) 3.1ppb HFPO-DA (GenX) ND Lead ND PFBS ND PFHxS ND PFNA ND PFOA ND PFOS ND Radium 226 + 228 1.65pCi/L Total Trihalomethanes 7.3ppb Uranium 17.0ppb

Filters that match

Start with this

Aquasana OptimH2O Reverse Osmosis + Claryum

under sink ro · diy

  • Arsenicremoves it, NSF or WQA certified
  • Nitrate (as N)removes it, NSF or WQA certified
See on Amazon

To cover everything flagged

Also

Whirlpool WHES40E 40,000 Grain Water Softener for 8 gpg hardness.

Detections ranked by share of the limitevery Tier 1 detection, highest first
Arsenic
6.8ppb of 10.0ppb
lab result 7.7ppb
68%
Elevated avg
Nitrate (as N)
5.00ppm of 10.00ppm
50%
Elevated
Uranium
10.0ppb of 30.0ppb
lab result 17.0ppb
33%
Detected avg
Radium 226 + 228
1.62pCi/L of 5.00pCi/L
lab result 1.65pCi/L
32%
Detected avg
Gross Alpha
3.02pCi/L of 15.0pCi/L
lab result 16.4pCi/L, uranium-adjusted
20%
Detected avg
Fluoride
0.72ppm of 4.00ppm
lab result 1.13ppm
18%
Detected avg
Total Trihalomethanes
4.1ppb of 80.0ppb
lab result 7.3ppb
5%
Detected avg
Copper 90th pct
0.06ppm of 1.30ppm
5%
Detected 90th pct
Haloacetic Acids (HAA5)
1.6ppb of 60.0ppb
lab result 3.1ppb
3%
Detected avg

Bar length is the highest result in the last 36 months as a share of the federal limit (MCL, or action level for lead and copper). The dark tick marks the limit. Gross alpha is compared after subtracting uranium, as DEQ does for compliance.

Full contaminants reporthighest, latest, limit, trend, last sample
ContaminantHighest, 36 moFederal limitShare of limitStatusTrendLast sample
Arsenic7.7ppb
latest 6.5ppb
10.0ppb MCL68%Elevated2026-06-22
Copper
90th percentile at home taps
note		0.06ppm1.30ppm AL5%Detected2026-06-30
Fluoride1.13ppm4.00ppm MCL18%Detected2026-01-26
Gross Alphanote16.4pCi/L
latest 11.2pCi/L
15.0pCi/L MCL20%Detected2026-06-10
Haloacetic Acids (HAA5)3.1ppb
latest 1.5ppb
60.0ppb MCL3%Detected2026-08-13
Hardness (as CaCO3)8.0gpgnoneno federal limitMeets2025-12-31
HFPO-DA (GenX)ND10.0ppt MCLNDNot detected2026-01-20 EPA study
Lead
90th percentile at home taps
note		0.0ppb15.0ppb AL0%Not detected2026-06-30
Nitrate (as N)5.00ppm
latest ND
10.00ppm MCL50%Elevated2026-08-13
PFBSNDnoneNDNot detected2025-04-16 EPA study
PFHxSND10.0ppt MCLNDNot detected2026-01-20 EPA study
PFNAND10.0ppt MCLNDNot detected2026-01-20 EPA study
PFOAND4.0ppt MCLNDNot detected2025-04-16 EPA study
PFOSND4.0ppt MCLNDNot detected2025-04-16 EPA study
Radium 226 + 2281.65pCi/L5.00pCi/L MCL32%Detected2026-06-10
Total Trihalomethanes7.3ppb80.0ppb MCL5%Detected2026-08-13
Uranium17.0ppb
latest 8.0ppb
30.0ppb MCL33%Detected2026-08-13
  • Copper: 90th percentile of samples taken at customer taps. Results depend on the home's plumbing.
  • Gross Alpha: Compliance uses the running average of gross alpha minus uranium. Shown value is the highest lab result; the adjusted average is 3.02 pCi/L after subtracting 6.7 pCi/L for uranium.
  • Lead: 90th percentile of samples taken at customer taps. Results depend on the home's plumbing.

ppb = parts per billion (µg/L), ppm = parts per million (mg/L), ppt = parts per trillion. ND = not detected above the lab's reporting limit. MCL = federal maximum contaminant level; AL = action level for lead and copper (90th percentile of home taps); aesthetic = secondary standard for taste, odor or staining, not health. Bars show the highest result in 36 months as a share of the limit.

15 other regulated contaminants tested
Contaminant36 mo maxLimitStatusLast sample
AntimonyND6.0ppbNot detected2026-01-26
AtrazineND3.0ppbNot detected2026-08-13
Barium0.06ppm2.00ppmDetected2026-01-26
BenzeneND5.0ppbNot detected2026-08-13
BerylliumND4.0ppbNot detected2026-01-26
CadmiumND5.0ppbNot detected2026-01-26
Chromium (total)ND0.10ppmNot detected2026-01-26
1,2-Dibromo-3-chloropropaneND0.2ppbNot detected2026-08-13
Lithium21.0ppbnoneDetected2025-04-16
Mercury (inorganic)ND2.0ppbNot detected2026-01-26
TetrachloroethyleneND5.0ppbNot detected2026-08-13
SeleniumND50.0ppbNot detected2026-01-26
Sodium52.20ppmnoneDetected2025-01-09
TrichloroethyleneND5.0ppbNot detected2026-08-13
ThalliumND2.0ppbNot detected2026-01-26

Hardness

City of Kuna reports hardness of 8 grains per gallon (137.73 mg/L as CaCO3), classified as hard in its 2025 Consumer Confidence Report. At 7 grains per gallon or more, a correctly sized softener usually pays for itself in appliance life and soap. Hardness is not a federal health violation.

See also Kuna water hardness.

Track record175 violations on record, 0 health-based
✓ 2017
✓ 2018
✓ 2019
174 2020
✓ 2021
1 2022
✓ 2023
✓ 2024
✓ 2025
✓ 2026

✓ no violation recorded n monitoring or reporting only n includes a health-based violation ? outside the loaded record

No health-based violations (MCL, treatment technique, or disinfectant level) in the last ten years.

Monitoring and reporting violations (175)

A required sample or report was late or missing. These do not mean a contaminant was found, but a system that skips monitoring has gaps in its record.

YearRuleCountDetail
2022Stage 1 Disinfectants and Disinfection Byproducts Rule1Monitoring and reporting (DBP) · Chlorine (residual)
2020Synthetic Organic Chemicals174Routine monitoring, major · 1,2-Dibromo-3-chloropropane, Atrazine
Lead and copper at the tap90th percentile of sampled homes against the action level
Lead at customer taps
0.0ppb 90th percentile · action level 15.0ppb
0%
Not detected 61 homes sampled, 2026-01-01 to 2026-06-30

90th percentile of samples taken at customer taps. Results depend on the home's plumbing. Results are from sampled homes in this system, not from your tap. Home plumbing can add lead and copper. First-draw samples run higher than flushed ones.

Copper at customer taps
0.06ppm 90th percentile · action level 1.30ppm
5%
Detected 61 homes sampled, 2026-01-01 to 2026-06-30

90th percentile of samples taken at customer taps. Results depend on the home's plumbing. Results are from sampled homes in this system, not from your tap. Home plumbing can add lead and copper. First-draw samples run higher than flushed ones.

Where the water comes from10 active wells

10 active wells, and 6 treatment points on record (SDWIS counts each chlorination or filtration point as a treatment plant).

WELL #9 (CEDAR 51): Susceptibility: ioc high (auto), voc high (auto), soc high (auto), microbial high (auto).

Source water assessment susceptibility: final map[IOC:Auto High Microbials:Auto High SOC:Auto High VOC:Auto High]; hydrologic sensitivity M; pci land use map[IOC:M Microbials:M SOC:M VOC:M]; system construction M;

Source names (10)

WELL #10 (CHAPPAROSA), WELL #11 (BUTLER PARK), WELL #12, WELL #3 (BUTLER PARK IRRIGATION), WELL #4 (CEDAR 49), WELL #5 (DISCOVERY CREEK), WELL #6 (SHORTLINE PARK), WELL #7 - (SMALL DANSKIN), WELL #8 - (LARGE DANSKIN), WELL #9 (CEDAR 51)

Every match, by categorytop three per category

We may earn a commission if you buy through these links. Rankings come from the matching engine (certification + flagged contaminants + annual cost), not from who pays more. How we earn money. As an Amazon Associate we earn from qualifying purchases. Prices are not shown; Amazon sets them on its site.

Drinking water

Under sink, pitcher, or faucet. Treats the water you drink and cook with.

Ranked first for this water under sink ro · DIY

Aquasana OptimH2O Reverse Osmosis + Claryum

Certified for arsenic, nitrate, and fluoride (NSF/ANSI 58, pentavalent); manufacturer-reported for uranium, radium 226 + 228, and gross alpha.

Plumber recommended if you are not comfortable with a drain saddle and a tank. Not a whole-house solution.

Certified forArsenic, Nitrate (as N), Fluoride, Total Trihalomethanes and 1 more
Manufacturer-reported, not certifiedUranium, Radium 226 + 228, Gross Alpha
See on Amazon
Also fits pitcher · DIY

Clearly Filtered Water Pitcher

Certified for total trihalomethanes and haloacetic acids (NSF/ANSI 53); manufacturer-reported for arsenic, nitrate, and uranium.

DIY. No plumbing.

Certified forTotal Trihalomethanes, Haloacetic Acids (HAA5)
Manufacturer-reported, not certifiedArsenic, Uranium, Nitrate (as N), Fluoride and 1 more
See on Amazon
Also fits under sink ro · DIY

APEC ROES-50 Essence 5-Stage Reverse Osmosis

Manufacturer-reported reduction for arsenic, nitrate, and uranium. Not NSF-certified for arsenic, nitrate, and uranium.

Plumber recommended if you are not comfortable with a drain saddle and a tank. Not a whole-house solution.

Manufacturer-reported, not certifiedArsenic, Uranium, Nitrate (as N), Fluoride and 4 more
See on Amazon

Whole house

Installed where water enters the house. For fixtures, laundry and showers.

Softener or conditioner

Worth it at 7 grains per gallon or more.

Ranked first for this water salt softener · DIY

Whirlpool WHES40E 40,000 Grain Water Softener

Certified for hardness, radium 226 + 228, and barium (NSF/ANSI 44). Does not address arsenic and nitrate.

DIY if you are comfortable with this install.

Certified forRadium 226 + 228, Barium, Hardness (as CaCO3)
See on Amazon
Pairing. The water is hard enough that an RO membrane will scale. Pair with a softener if you also want whole-house scale control.

Questions about City of Kuna

Is City of Kuna tap water safe to drink?

City of Kuna met every federal limit in the last 36 months, with no open health-based violation. 2 contaminants were at half the limit or higher: Arsenic and Nitrate (as N). The results table shows each value against its limit. Results reflect the system's sampling points, not the plumbing in any one home.

Is City of Kuna water hard?

City of Kuna reports hardness of 8.0 grains per gallon (138 mg/L as CaCO3), classified as hard. Hardness is not a health issue. At 7 grains or more most households see scale and soap scum; a softener is a reasonable choice.

Is City of Kuna water fluoridated?

Fluoride was measured at up to 1.13 mg/L in the last 36 months, in the range used for community fluoridation (0.7 mg/L). The federal limit (MCL) is 4 mg/L. Reverse osmosis is an optional preference if you want less fluoride.

Where does City of Kuna water come from?

City of Kuna draws from 10 active wells with 6 treatment plants on record. Source and treatment details are listed above.

What filter fits City of Kuna water?

For drinking water the matching engine ranks Aquasana OptimH2O Reverse Osmosis + Claryum first for this profile, based on certified reduction claims for the contaminants flagged above. See the filters section for the reasoning and alternatives.

Who to call

  • System contact: DAVILA, MATTHEW, 208-287-1728
  • DEQ Boise Regional Office, 1445 N Orchard St, Boise ID 83706, (208) 373-0550
  • Central District Health (well testing, septic, local health questions)

Sources

Sample results as of 2026-08-13; inventory and violations from EPA SDWIS; page built 2026-09-14. 355 individual results reviewed.

More: Kuna water, Ada County, Arsenic, Nitrate (as N)

Numbers are the system's samples at its taps and wells, not yours. Lead and copper are 90th percentiles from sampled homes. Well pages are nearby-sample estimates. Health text restates EPA and DEQ. Methodology.