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Tap water quality report

Caldwell City of

EPA monitoring tested this supplier for 99 contaminants and detected 12. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

99
contaminants tested
12
detected
74,000
people served
6
health-based violations
Idaho rankingsLead in IdahoPFAS in Idaho
Water source
Ground water
Ownership
Local government
Counties served
Canyon

Compliance record

Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.

6
health-based violations
516
violations on file
2
still open
ViolationTypeStatusPeriod
MCL Health-based Archived 1994-08-01 → 1994-08-31
MCL Health-based Archived 1992-12-01 → 1992-12-31
MCL Health-based Archived 1992-12-01 → 1992-12-31
MCL Health-based Archived 1992-11-01 → 1992-11-30
MCL Health-based Archived 1992-11-01 → 1992-11-30
MCL Health-based Archived 1991-07-01 → 1991-07-31
MR Monitoring Archived 2020-01-01 → 2022-12-31
MR Monitoring Archived 2020-01-01 → 2022-12-31
MR Monitoring Archived 2020-01-01 → 2022-12-31
MR Monitoring Archived 2020-01-01 → 2022-12-31

Other contaminants detected

Each bar shows the measured level as a share of the EPA limit: green is well under, amber is close to it, red is over. For lead and copper the limit applies to exactly the 90th-percentile figure shown, so red there means a real exceedance. For everything else the limit applies to a running annual average while the figure is the 95th percentile of this system's samples — over 100% is worth reading, but is not by itself a violation. Where a single sample came in higher than that percentile, it is noted under the bar. Formal violations are listed separately.
ContaminantLevel vs EPA limitDetection rateSourcePeriod
Nitrate
2100 µg/L 21%
of the EPA limit 10000 µg/L
worst single sample: 2700 µg/L
188/236 SYR4 2012–2019
Arsenic
8 µg/L 80%
of the EPA limit 10 µg/L
worst single sample: 8.2 µg/L
31/32 SYR4 2013–2019
Fluoride
770 µg/L 19%
of the EPA limit 4000 µg/L
worst single sample: 1050 µg/L
21/21 SYR4 2013–2019
Combined Uranium
12.2 µg/L 41%
of the EPA limit 30 µg/L
worst single sample: 16 µg/L
20/25 SYR4 2013–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 17/17 LCR 2023
Chromium
5 µg/L 5%
of the EPA limit 100 µg/L
 11/19 SYR4 2013–2019
Nitrate-Nitrite
2150 µg/L 22%
of the EPA limit 10000 µg/L
worst single sample: 2700 µg/L
11/14 SYR4 2016–2019
Lithium
16 µg/L
No EPA limit set
 10/16 UCMR-5 2025
Barium
60 µg/L 3%
of the EPA limit 2000 µg/L
 3/19 SYR4 2013–2019
Gross Alpha, Excl. Radon And U
11.595 pCi/L 77%
of the EPA limit 15 pCi/L
worst single sample: 11.6 pCi/L
2/2 SYR4 2019
Combined Radium (-226 And -228)
1.8 pCi/L 36%
of the EPA limit 5 pCi/L
 1/18 SYR4 2014–2019
Total Haloacetic Acids (HAA5)
2.08 µg/L 3.5%
of the EPA limit 60 µg/L
 1/20 SYR4 2012–2019
87 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane11Cl-PF3OUdS2,4,5-TP2,4-D4:2 Fts6:2 Fts8:2 Fts9Cl-PF3ONSAdonaAntimony, TotalAtrazineBhc-GammaBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCadmiumCarbofuranCarbon TetrachlorideChlordaneDichloromethaneDalaponDi(2-ethylhexyl) AdipateDi(2-ethylhexyl) PhthalateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHfpo-DaHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoMercuryMethoxychlorNetfosaaNfdhaNmefosaaNitriteOxamylPfbaPFBSPfdaPfdoaPfeesaPfhpaPfhpsPfhxaPFHXSPfmbaPfmpaPFNAPFOAPFOSPfpeaPfpesPftaPftrdaPfunaPentachlorophenolPicloramSeleniumSimazineStyreneTTHMTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
MARTIN, TERRY L
Phone
208-455-4793
Email
[email protected]

Frequently asked questions about Caldwell City of

Is Caldwell City of tap water safe to drink?

EPA monitoring detected 12 contaminants in Caldwell City of's water. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and the utility's annual Consumer Confidence Report for its official compliance status.

What contaminants were detected in Caldwell City of's water?

EPA monitoring detected Nitrate, Arsenic, Fluoride, Combined Uranium, Lead, and others. The full list with the level and data source for each is above.

How many people does Caldwell City of serve?

Caldwell City of reports serving 74,000 people in Idaho, per its EPA record.

Has Caldwell City of had any water quality violations?

The EPA has 516 violations on file for Caldwell City of, of which 6 are health-based (a contaminant limit or required treatment was breached) and 2 remain open. The rest are monitoring or reporting failures.

Where does this data come from?

Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.