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Cuesta La Honda Guild Inc

EPA monitoring tested this supplier for 79 contaminants and detected 17. A detection doesn't automatically mean the water is unsafe — the level and EPA source for each is below.

79
contaminants tested
17
detected
915
people served
10
health-based violations
California rankingsLead in CaliforniaPFAS in California
Water source
Surface water
Ownership
Private
Counties served
San Mateo

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.

10
health-based violations
74
violations on file
0
still open
ViolationTypeStatusPeriod
MCL Health-based Resolved 2021-10-01 → 2021-12-31
MCL Health-based Resolved 2021-10-01 → 2021-12-31
MCL Health-based Resolved 2021-07-01 → 2021-09-30
MCL Health-based Resolved 2021-07-01 → 2021-09-30
MCL Health-based Resolved 2021-04-01 → 2021-06-30
MCL Health-based Resolved 2021-04-01 → 2021-06-30
MCL Health-based Resolved 2021-01-01 → 2021-03-31
MCL Health-based Resolved 2021-01-01 → 2021-03-31
TT Health-based Resolved 2010-12-01 → 2010-12-31
TT Health-based Resolved 2010-12-01 → 2010-12-31

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
Bromodichloromethane
12.3045 µg/L
No EPA limit set
worst single sample: 14.61 µg/L
162/162 SYR4 2013–2019
Chloroform
50.0205 µg/L
No EPA limit set
worst single sample: 63.4 µg/L
162/162 SYR4 2013–2019
Dibromochloromethane
5.6775 µg/L
No EPA limit set
worst single sample: 6.37 µg/L
162/162 SYR4 2013–2019
Dichloroacetic Acid
46.295 µg/L
No EPA limit set
worst single sample: 53.8 µg/L
162/162 SYR4 2013–2019
TTHM
62.7035 µg/L 78%
of the EPA limit 80 µg/L
worst single sample: 77.8 µg/L
162/162 SYR4 2013–2019
Total Haloacetic Acids (HAA5)
73.035 µg/L 122%
of the EPA limit, at the 95th percentile of samples — 60 µg/L
worst single sample: 86.4 µg/L
162/162 SYR4 2013–2019
Trichloroacetic Acid
23.6 µg/L
No EPA limit set
worst single sample: 39.3 µg/L
160/162 SYR4 2013–2019
Dibromoacetic Acid
4.065 µg/L
No EPA limit set
worst single sample: 4.2 µg/L
108/162 SYR4 2013–2019
Monochloroacetic Acid
5.55 µg/L
No EPA limit set
worst single sample: 5.7 µg/L
36/162 SYR4 2013–2019
Fluoride
447.5 µg/L 11%
of the EPA limit 4000 µg/L
worst single sample: 530 µg/L
26/27 SYR4 2012–2019
Lead
0.0 mg/L 0%
of the EPA limit 0.0150 mg/L
 13/13 LCR 2023
Bromoform
2.256 µg/L
No EPA limit set
worst single sample: 2.52 µg/L
9/162 SYR4 2013–2019
Arsenic
3.74 µg/L 37%
of the EPA limit 10 µg/L
worst single sample: 3.8 µg/L
7/27 SYR4 2012–2019
Monobromoacetic Acid
2.08 µg/L
No EPA limit set
worst single sample: 2.1 µg/L
5/161 SYR4 2013–2019
Nitrate
4100 µg/L 41%
of the EPA limit 10000 µg/L
 4/60 SYR4 2012–2019
Copper
81 µg/L 6.2%
of the EPA limit 1300 µg/L
 1/27 SYR4 2012–2019
Di(2-ethylhexyl) Phthalate
0.2100 µg/L 3.5%
of the EPA limit 6 µg/L
 1/7 SYR4 2014–2018
62 contaminants tested, none detected
1,1,1-Trichloroethane1,1,2-Trichloroethane1,1-Dichloroethylene1,2,4-Trichlorobenzene1,2-DIBROMO-3-CHLOROPROPANE1,2-Dichloroethane1,2-Dichloropropane2,3,7,8-TCDD2,4,5-TP2,4-DAntimony, TotalAsbestosAtrazineBhc-GammaBariumBenzeneBenzo(A)PyreneBeryllium, TotalChlorobenzeneCyanideCadmiumCarbofuranCarbon TetrachlorideChlordaneChromiumDichloromethaneDalaponDi(2-ethylhexyl) AdipateDinosebDiquatEthylene DibromideEndothallEndrinEthylbenzeneGlyphosateHexachlorobenzeneHeptachlorHeptachlor EpoxideHexachlorocyclopentadieneLassoLeadMercuryMethoxychlorNitriteOxamylPentachlorophenolPicloramSeleniumSimazineStyreneTetrachloroethyleneThallium, TotalTolueneTotal Polychlorinated Biphenyls (PCB)ToxapheneTrichloroethyleneVinyl ChlorideXylenes, Totalcis-1,2-DichloroethyleneO-DichlorobenzeneP-Dichlorobenzenetrans-1,2-Dichloroethylene

Utility contact

Contact
MAHONEY, TERRY
Phone
650-747-9766
Email
TMAHONEY22@GMAIL.COM

Frequently asked questions about Cuesta La Honda Guild Inc

Is Cuesta La Honda Guild Inc tap water safe to drink?

EPA monitoring detected 17 contaminants in Cuesta La Honda Guild Inc'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 Cuesta La Honda Guild Inc's water?

EPA monitoring detected Bromodichloromethane, Chloroform, Dibromochloromethane, Dichloroacetic Acid, TTHM, and others. The full list with the level and data source for each is above.

How many people does Cuesta La Honda Guild Inc serve?

Cuesta La Honda Guild Inc reports serving 915 people in California, per its EPA record.

Has Cuesta La Honda Guild Inc had any water quality violations?

The EPA has 74 violations on file for Cuesta La Honda Guild Inc, of which 10 are health-based (a contaminant limit or required treatment was breached) and 0 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.