Abstract: Noise measurements of nuclear spin systems using a tuned circuit can reveal the signatures of two different phenomena: Thermal circuit noise absorbed by the spin system, and nuclear spin-noise leading to tiny fluctuating magnetization components. Both phenomena can be detected by conventional NMR spectrometers without applying rf irradiation. Although the fluctuating processes themselves are weak, polarization enhancement can lead to an increase of the observed spin-noise amplitudes due to an enlarged coupling with the reception circuit. In this work we explore the detection of noise in ¹H NMR of liquid water samples whose spin alignment has been enhanced via ex situ dynamic nuclear polarization, and explore which of the mechanisms must be invoked to explain the experimental results. A number of ancillary phenomena related to this kind of experiments are also documented.